第一篇：初一情态动词讲解及练习附答案
(could), may(might), must, have to, shall(should, will(would), dare(dared), need(needed), ought to等。情态动词无人称和数的变化；不能单独使用，必须与其后的动词原形构成谓语
一、can, could
1)表示能力（体力、知识、技能）。Can you lift this heavy box?（体力）
Mary can speak three languages.（知识）Can you skate?（技能）
此时可用be able to代替。Can只有一般现在时和一般过去式；而be able to则有更多的时态。
I‘ll not be able to come this afternoon.当表示―经过努力才得以做成功某事‖时应用be able to，不能用Can。如：
He was able to go to the party yesterday evening in spite of the heavy rain.2)表示请求和允许。
-----Can I go now?-----Yes, you can./ No, you can‘t.此时可与may互换。在疑问句中还可用could, might代替，不是过去式，只是语气更委婉，不能用于肯定句和答语中。
----Could I come to see you tomorrow?----Yes, you can.(No, I‘m afraid not.)3)表示客观可能性（客观原因形成的能力）。
They‘ve changed the timetable, so we can go by bus instead.This hall can hold 500 people at least.4)表示推测（惊讶、怀疑、不相信的态度），用于疑问句、否定句和感叹句中。
Can this be true? This can‘t be done by him.How can this be true?
二、may, might
1)表示请求和允许。might比 may语气更委婉，而不是过去式。否定回答时可用can‘t 或mustn‘t，表示―不可以，禁止‖。---Might/ May I smoke in this room?----No, you mustn‘t.---May/Might I take this book out of the room?
----Yes, you can.(No, you can‘t / mustn‘t.)用May I...？征徇对方许可时比较正式和客气，而用Can I...？在口语中更常见。
2）用于祈使句，表示祝愿。May you succeed!3)表示推测、可能性（不用于疑问句）。might不是过去式，它所表示的可能性比may小。
1．He may /might be very busy now.2．Your mother may /might not know the truth.三、must, have to 1)表示必须、必要。You must come in time.在回答引出的问句时，如果是否定的，不能用mustn‘t（禁止，不准），而用needn‘t, don‘t have to（不必）.----Must we hand in our exercise books today?----Yes, you must.----No, you don‘t have to / you needn‘t.2)must是说话人的主观看法，而have to则强调客观需要。Must只有一般现在时，have to 有更多的时态形式。1． he play isn‘t interesting, I really must go now.2． I had to work when I was your age.3)表示推测、可能性（只用于肯定的陈述句）
1． You‘re Tom‘s good friend, so you must know what he likes best.2． Your mother must be waiting for you now.四、dare, need
1)dare作情态动词用时, 常用于疑问句、否定句和条件从句中, 过去式形式为dared。
1． How dare you say I‘m unfair? 2． He daren‘t speak English before such a crowd, dare he?
3． If we dared not go there that day，we couldn‘t get the beautiful flowers.2)need 作情态动词用时, 常用于疑问句、否定句。在肯定句中一般用must, have to, ought to, should代替。1．You needn‘t come so early.2.----Need I finish the work today?----Yes, you must./ No, you needn‘t.3)dare和 need作实义动词用时，有人称、时态和数的变化。在肯定句中，dare后面常接带to的不定式。在疑问句和否定句中，dare后面可接带to或不带to的不定式。而need后面只能接带to的不定式。
1.I dare to swim across this river.2.He doesn‘t dare(to)answer.3.He needs to finish his homework today.五、shall, should 1)shall 用于第一人称，征求对方的意见。What shall we do this evening? 2)shall 用于第二、三人称，表示说话人给对方的命令、警告、允诺或威胁。
1.You shall fail if you don‘t work hard.(警告)2.He shall have the book when I finish it.(允诺)3.He shall be punished.(威胁)
六、will, would
1)表示请求、建议等，would更委婉。Will / Would you pass me the ball, please?
2)表示意志、愿望和决心。1.I will never do that again.2.They asked him if he would go abroad.3)would表示过去反复发生的动作或某种倾向。would表示过去习惯时比used to正式，且有―现已无此习惯‖的含义。1.During the vacation, he would visit me every other day.2.The wound would not heal.4)表示估计和猜想。It would be about ten o‘clock when she left home.七、should, ought to 1)should, ought to表示―应该‖，ought to表示义务或责任，比should语气重。1.I should help her because she is in trouble.2.You ought to take care of the baby.2)表示劝告、建议和命令。should, ought to可通用，但在疑问句中常用should。
1.You should / ought to go to class right away.2.Should I open the window? 3)表示推测
should , ought to(客观推测), must(主观推测)。1.He must be home by now.(断定他已到家)2.He ought to/should be home by now.(不太肯定)3.This is where the oil must be.(直爽)4.This is where the oil ought to/should be.(含蓄)
情态动词 can 表示能力，意为 ―能 会‖
表示推测，意为 ―可能‖，常用于否定句和疑问句中
表示请求，允许，意为―可以‖
could can 的过去式，意为―能、会‖，表示过去的能力
在疑问句中表示委婉请求
may 表示请求、许可，意为―可以‖
表示推测，常用于肯定句中，意为―可能、也许‖
might may的过去式
表示推测，常用于肯定句中，意为― 可能、也许 ‖
must 表示主观看法，意为―必须、应该‖
表示有把握的推测，用语肯定句
Need 表示需要、必须，主要用于否定句和疑问句中
dare 表示敢于，主要用于否定句和疑问句中
should 意为― 应该‖，表示要求和命令
表示劝告、建议
had better 意为 ―最好‖，表示建议
used to 意为 ―过去常常，表示过去的动作、行为
考点知识清单
知识梳理
情态动词有具体的词义，但也同助动词一样，需要与其他词语一起构成句子的谓语，另外情态动词没哟人称和数的变化，情态动词后必须跟动词原形。
考点一 can，may，must 等情态动词在陈述句中的用法
1.can 的用法
（1）表示能力、许可、可能性。表示能力时一般译为―能、会‖，即有种能力，尤其是生来具备的能力，此时may 和must 均不可代替它。如：
She can swim fast, but I can‘t.她能游得很快，但我不能。
I can see with my eyes.我用眼睛看。
（2）表示可能、能够。如：
I can finish it in an hour.我能在一小时后完成它。
（3）表示许可，常在口语中。如：
You can use my dictionary.你可以用我的字典。
（4）表示推测，意为―可能‖，常用于否定句和疑问句中，此时can‘t 译为― 不可能‖。如：
Can the news be true? 这个消息会是真的吗？
----Can it be our teacher?
那个人有可能是我们老师吗？
----No, it can‘t be our teacher.He is on a visit to the Great Wall.不可能。咱们老师正在游览长城呢。
例---I think Miss Gao must be in the library.She said she would go there.-----No.She __ be there, I have just been there.A.can‘t B.mustn‘t C.needn‘t D.wouldn‘t
[解析]
根据下文―我刚去过那儿‖可知，应为― 不可能‖，can‘t 表示推测
[答案] A
2.could的用法
（1）can的过去式，意为― 能、会‖，表示过去的能力。如：
He could write poems when he was 10.他十岁时就会写诗。
（2）could 在疑问句中，表示委婉的语气，此时 could 没有过去式的意思。如:
Could you do me a favour? 你能帮我个忙吗？
---Could I use your pen? 我能用一下你的钢笔吗?
--Yes, you can.可以。
3.may的用法
（1）表示请求、许可，比can 正式，如：
May I borrow your bike? 我可以借你的自行车吗？
You may go home now.现在你可以回家了。
例----_______ I borrow your MP3?
-----Sure.Here you are.A.May B.Should C.Must D.Would
【解析】 在此处表示请求，意为― 做……可以吗‖。
答案 A
(2)表示推测，谈论可能性，意为― 可能，或许‖，一般用于肯定句中。如：
It may rain tomorrow.明天可能会下雨。
She may be at home.她可能在家呢.(3)may的过去式为might，表示推测时。可能性低于may。如：
He is away from school.He might be sick.他离开学校了，可能是他生病了。
4.must的用法
(1)must 表示主观看法，意为―必须、一定‖。如：
You must stay here until I come back.在我回来之前你必须呆在这儿。
Must I hand in my homework right now?
我必须现在交作业吗？
(2)其否定形式mustn‘t 表示― 一定不要 ‖ ―千万别‖ ―禁止, 不许‖.如：
You mustn‘t play with fire.你不许玩火。
You mustn‘t be late.你一定不要迟到。
（3）对must引导的疑问句，肯定回答为must，否定回答为needn‘t 或 don‘t have to.如：
---Must I finish my homework?
我现在必须完成作业吗？
---No, you needn‘t.不，你不必。
(4)must 表示有把握的推测，用于肯定句。如:
The light is on, so he must be at home now.灯亮着，他现在肯定在家。
注意其反意问句的构成形式：
当must 表示 肯定的判断、推测时，其反意疑问句要用实际问句的助动词来构成。
如：
She must have finished writing, hasn‘t she?
她一定已经写完了，不是吗？
5.need的用法
（1）need 表示需要、必须，主要用于否定句和疑问句中，其否定形式为needn‘t，意为―没有必要，不必‖。用need 提问时，肯定回答为 must，否定回答为 needn‘t。如：
----Need I stay here any longer? 我还有必要留在这儿吗？
----Yes, you must.是的。
-----No.you needn‘t.不，你不必。
(2)need 还可以作实义动词，此时有人称、数和时态的变化，后边多接动词不定式。如：
I need to do it right now.我需要马上做这件事。
He needs to learn more about the girl.他需要多了解那个女孩。
6.dare 的用法
dare意为―敢、敢于‖, 用法近似于need，有两种词性：
（1）dare 作为情态动词，多用于否定句、疑问句或条件句中，无第三人称单数形式，只有一般现在时和一般过去时。如：
Dare he tell them what he knows?
他敢告诉他们所知道的情况吗？
I daren‘t ask her – will you do it for me?
我可不敢问她，你能帮我问问吗？
（2）dare 作为实义动词，此时有人称、数及时态的变化。如：
He doesn‘t dare to break his promise.他不敢食言。
注意： 在口语中，dare 的各种形式常与不带to 的不定式连用。如：
Do you dare tell her what I said?
你敢告诉她我说的话吗？
I didn‘t dare look at him.我不敢看他。
7.shall 的用法
（1）shall 表示征求对方意见（多用于第一、三人称），如：
Shall we go out for a walk? 我们出去散步好吗？
(2)表示决心、警告、命令（多用于第二、三人称），如：
No one shall bring your beepers or mobile phones in the exam.考试中任何人不准带BP机和手机。
8.should的用法
（1）should 意为―应该‖，可表示劝告、建议、义务、责任等。如：
We should protect the environment.我们应该保护环境。
（2）should(would)like to do sth.表示―想要、愿意做某事‖，常用于口语中。如：
I should(would)like to go with you.我愿意和你一起去。
Would you like to go with me? 你想和我一起去吗？
（3）Should have done 表示对过去动作的责备、批评。如：
You should have finished your homework.你应该已经完成作业了。（事实上你没有完成。）
9.will 的用法
will表示意愿、意志、打算，可用于多种人称。如：
I will help you if I‘m free this afternoon.今天下午如果我有空，我就会帮你。
10.had better 的用法
had better 意为―最好‖，没有人称的变化，后面接不带to 的不定式，其否定形式为： had better not。如：
We had better go now.我们最好现在就走。
You had better not give the book to him.你最好不要把这本书给他。
考点二 含有情态动词的疑问句
1.由 can、may、must构成的疑问句
（1）句式： Can/ May/ Must… + 主语+动词原形+….？ 如：
Can you repair the car? 你会修小汽车吗？
Could he be a good student? 他能是名好学生吗？
May I borrow your ruler? 我可以借你的尺子吗？
Must we clean the room now?我们必须现在打扫房间吗？
（2）对 may 引出的问句，可以有下列回答方式：
Yes, of course.Yes, certainly.Sure.No, you mustn‘t.No, you can‘t.（3）对must引出的疑问句，回答方式为：
Yes, …must.No,… needn‘t/ don‘t have to.2.will，would，shall 的用法
（1）will 在一般疑问句中表示客气的―请求、劝说‖。would 是will 的过去式，语气更加客气、委婉。如：
Would you show me your picture book? 你能让我看看你的画册吗？
Will you please give me a call? 请给我打个电话好吗？
（2）对 will/ would you… 的回答方式有以下几种：
Yes, I will.(No, I won‘t.)
Sure.(I‘m sorry , I can‘t.)
All right.Certainly.(No, thank you.)
Yes, please.例---Would you do me a favour and pass on my thanks to Lily?
-----________.A.That‘s right B.With pleasure C.It doesn‘t matter D.No trouble
解析 A.意为―对了‖，B.意为― 乐意效劳‖, C.意为― 没关系‖ D.意为―不费事‖。
答案 B
（3）shall引出的疑问句用于第一人称，表示征求对方意见或客气的请求。如：
我给你把门打开好吗？
我们现在开始好吗？
其回答方式有以下几种：
Yes, please.All right.No, thank you.考点三 不同情态动词的否定意义也不同
1.（1）can‘t可译为―不会‖，如：I can‘t play basketball.我不会打篮球。
（2）当句子表推测时，用can‘t 表达不可能，如：
He can‘t be ill.He is playing chess with Tom.他不可能病了，他正和Tom 下棋呢。
（3）can‘t 还可用来回答― May I …? ‖ 这样的问句。如：
May I come in ? 我可以进来吗？
No, you mustn‘t./ can‘t.不，你不能。
（4）can‘t 还可用于固定习语中。如：
She can‘t help crying.她不禁大哭起来。
2.may 的否定式为 may not，译成― 可能不‖，如：
He may not be at home.他也许不在家。
3.（1）mustn‘t 表示不许，不可。如：
He mustn‘t leave his room.他不许离开他的房间。
You mustn‘t talk in class.你们不可以在课上说话。
(2)mustn‘t 也可用于以 may 表示要求时的否定回答中。如：
——May I stand here? 我可以站在这里吗？
------No, you mustn‘t(can‘t).不，不行。
4.（1）needn‘t 意为― 不必‖。如：
You needn‘t meet him unless you‘d like to.你不需要见他，除非你愿意。
（2）needn‘t + have+ 动词的过去分词，表不需要完成但已完成的动作，暗含时间或精力上的浪费。如：
You needn‘t have bought it.你没必要买它（但你却买了）。
5.shouldn‘t 表示不应该。如：
You shouldn‘t feel so unhappy over such little things.对于这种小事，你不应该感到这么不高兴。
考点四 情态动词的被动语态
含有情态动词的被动语态的结构为： 情态动词+ be + done(动词的过去分词)。
做题时要兼顾情态动词和被动语态这两个方面。如：
You needn‘t get up so early every day.你不必每天都起这么早。
She shouldn‘t speak t her mother in that way.她不应该用那种方式和妈妈说话。
More and more trees must be planted in China.在中国必须种植更多的树木。
Many of the stars can not be seen because they are far away from us.很多星星我们都看不到，因为它们离 我们太远了。
易混知识清单
知识归纳
易混点一 can 和 be able to
两者表示能力时用法相同，但 can 只有原形 ―can‖ 和过去式― could ‖两种形式，在其他时态中 要用be able to 来表示。另外 be able to 常常指经过努力，花费了时间和劳力之后才能做到某事。如：
Jim can‘t speak English.吉姆不会说英语。
He could speak English at 5.他五岁时 就会说英语。
We‘ll be able to see him next week.下星期我们将会见到他。
He has been able to drive.他已经会开车了。
I ‗ m sure you ‗ll be able to finish it quickly.我相信你能迅速地完成。
We were able to reach the top of the mountain at noon.我们能在中午到达山顶。
易混点二 can和may
1.can 和 may 均可用来征求意见或许可，意为―可以‖，一般可互换使用。如：
Can/ May I help you ? 我能帮助你吗？
2.can 和may 表示可能性时的区别：
1)在肯定句中用 might，may，must，不用can
2)在疑问句中表示推测用 can，不用 might，may，must
3)在否定句中用can‘t（不可能），不用 may，must。如：
She may be in the classroom.她可能在教室里。
Where can they be now? 他们现在可能在哪儿？
That can‘t be true.那不可能是真的。
易混点三 may be 和maybe
用法区别 常用位置
may be may为情态动词，be为动词原形 句中，作谓语
maybe 副词，大概、也许，相当于perhaps 句首，作状语
He may be wrong , but I‘m not sure.也许他错了，但我也不确定。
易混点四 can‘t 和 mustn‘t
1.can‘t 根据其基本用法可译为：
（1）不会，如：
I can‘t speak English.我不会说英语。
（2）不能，如：
We can‘t do it now because it‘s too dark.天太黑了，我们现在干不了。
（3）不可能，如：
那个人不可能是咱们老师，他年轻得多。
The man can‘t be our teacher because he is much younger than our teacher..2.mustn‘t 意为― 禁止、不许‖，用来表达命令，表示强烈的语气。如：
You mustn‘t play football in the street.It‘s too dangerous.你不可以在街上踢足球，太危险了。
易混点五 must 和 have to 1.must 侧重于个人意志和主观上的必要，还可以在间接引语中表示过去的必要或业务。
2.have to 侧重于客观上的必要，可用于现在时、过去时和将来时。如：
I know I must study hard.我知道我必须努力学习。
My brother was very ill, so I had to call the doctor in the mid-night.我弟弟病得厉害，我只得半夜里把医生请来。
I haven‘t got any money with me, so I‘ll have to borrow some from my friend.我身上没带钱，只好向朋友借点了。
He said they must work hard.他说他们必须努力工作。
易混点六 need，dare 的两种用法
3.need，dare 作情态动词是，多用于否定句、疑问句中，后接动词原形。如：
You needn‘t explain it to me.你不必向我解释这件事。
Dare you say that again? 你敢再说一遍吗？
3.在肯定句中，它们后边多接动词不定式，此时为实义动词。如：
Tom needs to fetch the bool for me.汤姆需要给我取回那本书。
Mary dared to go across the street by herself.玛丽敢自己过马路。
易混点 七 used to do / be used to doing / be used to do…
used to do 表示过去常常发生的动作，强调过去，只用于过去，注意用 to do，不用doing形式；而be used to doing 意为―习惯做…‖，be 可有各种时态； be used to do 意为―……被使用去做……,‖ 为被动语态形式。如：
My father used to eating meat.我父亲过去起床晚，但现在不得不早起了。
She is used to eating meat.她习惯吃肉。
He wasn‘t used to eating in a restaurant.他不习惯在饭店吃饭。
Knives are used to cut things.刀是被用来切东西的。（被动语态）
方法技巧清单
方法技巧
方法一 了解命题规律
测试内容出现频率较高的情态动词主要集中在 can，may，must，need 等次的用法上，重点为以下四点:
1.can，could 表能力的用法。
2.常见情态动词的提问和回答，尤其是 May I …？ No，you mustn‘t/ can‘t.Must I …?
No, you needn‘t/
3.表示推测的用法，肯定句中用may（可能），must（一定），否定句中用may not（可能不），can‘t（不可能）。注意 can‘t 与mustn‘t 的区别。
4.情态动词的被动语态。
方法二 掌握突破方法
1.从整体上把握情态动词的基本用法。
例 — ________ you pass me a pen? I‘d like to write down the phone number.—Sure.Here it is.A.Can B.Need C.Might D.Must
【解析】 由题干可知，本句表示请求、许可。
【答案】 A
2.逐个学习，了解每个情态动词的用法特征。
例 —May I go to the cinema, mum? — Certainly, but you ________ be back by 11 o‘clock.A.can B.may C.must D.need
[解析] 由题意可知，此处并非表推测的用法，而是妈妈对孩子提出的要求，故选C, 意为― 必须‖。
[答案] C
3.认真区别具有相同功能的、意思相近的情态动词的用法。
例 You ______ get there by bus.A.don‘t need B.needn‘t to C.don‘t need to D.need don‘t to
【解析】 由选项A 可知 need 为实义动词，故应加上to 才正确。选项 B needn‘t为情态动词，应去掉to，故选 C.答案 C
4.解答情态动词的题目时，一定要细心领会情景特征，不要放过任何细节，只有这样才能找到足够的信息，确定最佳答案。
例 You _______ worry about me.It‘s nothing serious.A.can‘t B.mustn‘t C.needn‘t D.won‘t
【解析】 由题干 It‘s nothing serious 可推断，第一句意为―你不必为我担心‖，故选C。本题易错选B, mustn‘t 意为―禁止‖，故不正确。
答案 C
易错题型清单错题透视错因一 语境理解错误例—Excuse me.Is this the right way to the Summer Please? —Sorry, I‘m not sure.But it _______ be.[分析] 考查情态动词might 表推测的用法。―I‘m not sure‖ 说明说话者的语气并不肯定，所以要用 might。
答案 A【错因透视】 情态动词表示推测时，肯定句中用 might，may，must，其肯定程度递增。
错因二 否定形式混淆
例 The man in the office___be Mr.Black because he went home just now.A.mustn‘t B.may not C.can‘t D.needn‘t
【分析】 由下文 he went home just now 可知，作者判断办公室里那个人（不可能是Mr.Black。mustn‘t 意为―千万别‖，may not 意为 ―可能不‖，needn‘t意为―不必‖。
can‘t 意为不可能，故选C。
答案 C
【错因透视】 情态动词的否定式含义不同，要牢记每个否定式的不同含义。
错因三 相似词语混淆
例---Can you go surfing with us this afternoon?
----I‘d like to , but I __ look after my sister at home , because my mother is ill.A.need B.must C.have to D.should
【分析】 由题干my mother is ill 为客观要求可知，选C.答案 C
[错因透视] 相似词组must 表示主观愿望，have to 则为客观要求。学生由于不清楚这一点而误选B项。
错因四 疑问答语 易错解
例----May I take this book out of the reading room?
------______.Please read it here.A.Certainly B.No, you needn‘t C.No, you mustn‘t D.No, you may not
【分析】 May I …? 的否定答语为 No, you can‘t/ mustn‘t.;Must I …?否定答语为 No，you needn‘t/don‘t have to.;Can I …? 的否定答语为 No，you can‘t.在口语交际中，要体会句子中的情感差别。
【答案】 C
【错因透视】学生由于看到问句中用的情态动词may 而误选D项。应该注意在有问话与答语的上下文中，下文不一定要填上文出现的情态动词，而要注意情感的细微变化。
情态动词练习(1)
1． May I stop my car here? No, you_＿＿＿.A.can't B.mustn't C.needn't D.don't have to 2.Must we clean the house now? No, you _______.A.needn't B.may not C.mustn't D.can't 3.John his father about his failure in the exam.A.dares not tell B.dares not telling C.dare not tell D.dares not to tell 4.You return the book now.You can keep it next week if you like.A.can't B.mustn't C.needn't D.may not 5.Johnny, you play with the knife, you hurt yourself.A.won't...can't B.mustn't...may C.shouldn't, must D.can't...shouldn't 6.The fire spread through the hotel very quickly but everyone get out.A.had to B.would C.could D.was able to 7.Would you go out for a walk with me? No, I.My girl friend is coming.A.wouldn't B.shall not C.won't D.shouldn't 8.Man die without water.A.will B.can C.need D.shall 9.If he started at 9 0'clock, he be there by now.A.need B.shall C.ought to D.must 10.I mailed the letter two weeks ago.She_____it.A.must receive B.can't receive C.might receive D.must have received 11.The professor gave orders that the experiment before 5:30p.m.A.be finished B.will finish C.must be finished D.would be finished 12.There was plenty of time.You_____.A.mustn't hurry B.mustn't have hurried C.needn't hurry D.needn't have hurried 13.Tom was a diligent boy.He go to school though it was raining hard.was able to B.could C.couldn't D.wasn't able to
14.______I go back before lunch? No, I don't think you________.A.Need...must B.Do...need to C.Must...have to D.May....ought to 15.The teacher do all the exercises, but a pupil_______.A.needn't....must B.may not...must C.needn't....needn't D.can't....must 16.Would you open the window please ? Yes, I______.A.will B.would C.do D.can 17.A lion only attacks a human being when it is hungry.A.should B.can C.will D.shall 18.____Must I finish this novel this morning ? ____No, you_____.A.mustn't B.might not C.don't have to D.can't 19.The taxi ____ only hold six passengers.It is full.You take the next one.A.may...may B.can...may C.may...can D.must...can 20.I a little earlier, but I met a friend of mine on the way.A.may come B.may have come C.could have come D.must have come 21.I wish to go home now, I? A.may B.can't C.must D.do 22.He must have finished his homework, he? A.mustn't B.didn't C.needn't D.hasn't 23.This pen looks like mine, yet it isn't.Whose it be? A.must B.can C.may D.might 24.He didn't do well in the exam.He hard at his lessons.A.must have worked B.ought to have worked C.would have worked D.has worked 25.I wonder how he that to the teacher.A.dare to say B.dare saying C.not dare say D.dared say 26.Mr Baker, a number of students want to see you._____ they wait here or outside? A.Should B.Will C.Shall D.Are 27.You the trees.Look, it is raining now.A.mustn't have watered B.needn't have watered C.could have watered D.might have watered 28.I give you an answer tomorrow.I promise!A.must B.will C.may D.shall 29.As a soldier, you do as the head tells you.A.will B.shall C.may D.ought 30.The streets are all dry.It_____ during the night.A.can't have rained B.must have rained C.couldn't rain D.shouldn't have rained 31.“When _____ he leave the hospital?” I asked the doctor.A.will B.shall C.can D.may 32.They have not finish the work up to now.____Well, they ______ A.should have B.should C.ought to D.ought have 33.Since it is already midnight, we______.A.had better leaving B.ought to have leave C.should take our leave D.might as well leave 34.you be happy!A.May B.Can C.Must D.Would 35.Must we come tomorrow? A.No, you can't B.No, you needn't C.No, you mustn't D.No, you may not 36.You miss the lesson, though we have it on Thursday.A.mustn't...needn't B.needn't....mustn't C.mustn't...mustn't D.needn't...needn't 37.To succeed in a difficult task,_____.A.one needs to work hard B.to work hard is needed C.you need be a hard working person D.to work hard is what one needs 38.In case I______, I would try again.A.will fail B.would miss C.should fail D.shall miss 39.Some people feel that handguns______.A.should control B.should be controlled C.must be controlling D.can be control 40.______ open the door for you ? A.Would you like that I B.Do you want that I C.Will I D.Shall I 41.My son ____ the examination, but he wasn't careful enough.A.might be able to pass B.must have passed C.could have passed D.were able to pass 42.Isn't it strange that the lazy boy pass the exam? A.should B.has C.might D.would 43.We the work so early without your help.A.couldn't finish B.can't finish C.couldn't have finished D.can't have finished 44.We the manager, but no one _____ his telephone number.A.could have called, knew B.could have called, had known C.could call, had known D.could call, knew 45.“Would you come and join them?” “I wish I.But I am busy at this moment.A.can't B.couldn't C.could D.can 46.If Alice this afternoon, the meeting should be put off.A.would not come B.might not come C.should not come D.could not come 47.I didn't see her in the meeting room this morning.She at the meeting.A.mustn't have spoken B.shouldn't have spoken C.needn't have spoken D.couldn't have spoken 48.With so much work on hand, you to see the game last night.A.mustn't go B.shouldn't go C.couldn't have gone D.shouldn't have gone 49.I thought you like something to read, so I have brought you some books.A.may B.might C.could D.must 50.There was plenty of time.She______.A.mustn't have hurried B.couldn't have hurried C.must not hurry D.needn't have hurried 51.It's still early, you______.A.mustn't hurry B.wouldn't hurry C.may not hurry D.don't have to hurry 52.Please open the window,________? A.can't you B.aren't you C.do you D.will you 53.We for her because she never came.A.mustn't have waited B.shouldn't have waited C.mustn't wait D.needn't wait 54.May I stop here? No, you ____.A.mustn't B.might not C.needn't D.won't 55.He _____ you more help, even though he was very busy.A.might have given B.might give C.may have given D.may give 56.I didn't see her in the meeting room this morning.She at the meeting.A.mustn't have spoken B.shouldn't have spoken C: needn't have spoken D.couldn't have spoken 57.Could I borrow your dictionary? Yes, of course you______.A.might B.will C.can D.should 58.Please don't make a noise.--I'll be as quiet as a mouse.A.Yes, I won't B.No, I won't C.No, I will D.Yes, I will 59.The young man has made so much noise that he not have been allowed to attend the concert.A.could B.must C.would D.should 60.One ought for what one has done.A.not to be punished B.to not be punished C.to not punished D.not be punished 61.If you really want yourself to be in good health, you must always so much..A.not, be smoking B.not, have smoked C.not, to smoke D.be not, smoking 62.Where is Mary? She isn't here.I think she_____.A.may have gone home B.must have gone home C.might have gone home D.All the above 63.I think Helen is at home.No, she be at home, for she phoned me from the airport just five minutes ago.A.mustn't B.needn't C.can't D.dared not 64.She is already two hours late.What to her? A.can have happened B.may have happened C.should have happened D.must happen 65.― he be watching TV now?‖ ”Yes, he be watching TV now?“ ”No, he be watching TV now." A.Must, can, mustn't B.Can ,must, can't C.Can, can, mustn't D.May, must, needn't 66.You must be a writer, ______? A.mustn't you B.are you C.must you D.aren't you 67.You must have seen him last night, ? A.haven't you B.didn't you C.don't you D.must you 68.I got up early this morning, but I _______so because I had no work to do.A.mustn't have done B.didn't need to do C.needn't have done D.can't have done 69.Let's say that you could go there again, how feel? A.will you B.should you C.would you D.do you 70.I daren't tell you what he did for fear that he angry with.A.will be B.is C.was D.should be 71.Without the leadership of the Party, there no New China.A.would be B.has been C.was D.should be 72.It is necessary that we a foreign language.A.must master B.ought to master C.master D.should master 73.Most of the students felt rather disappointed at the English party.They say that it _______ better organized.A.had been B.had to be C.must have been D.could have been 74.I am surprised that he to help me when I needed it most.A.should refuse B.would have refused C.should have refused to D.may have refused 75.Look!Tom is too sleepy to work.He __ up watching TV.A.mustn't have stayed B.shouldn't have stayed C.mustn't stay D.ought not to say.练习题答案
1－10
BACCB
DCADD 11－20
ADACA
ACCBC 21－30
ADBBD
CBBBA 31－40
BADAB
AACBD 41－50
CACAC
CDDBD 51－60
DDBAA
DCBDA 61－70
ADCAB
DBCCB 71－75
ADDCB
第二篇：情态动词语法经典练习
情态动词语法经典练习：
1.He ______ you more help, even though he was very busy.A.might have givenB.might giveC.may have givenD.may give
2.Jenny______ have kept her word.I wonder why she changed her mind.A.mustB.shouldC.needD.would
3..-Could I borrow your dictionary?
-Yes, of course you_________
A.mightB.will C.canD.should
4.I told Sally how to get here, but perhaps I ______ for her.A.had to write it outB.must have written it out
C.should have written it outD.ought to write it out
5.—Shall I tell John about it?
—No, you ______.I've told him already.A.needn'tB.wouldn't
C.mustn'tD.shouldn't
6.─There were already five people in the car but they managed to take me as well.─ It______ a comfortable journey.A.can't beB.shouldn't be
C.mustn't have beenD.couldn't have been
7.It's nearly seven o'clock.Jack______ be here at any moment.A.mustB.needC.shouldD.can
8..When he was there, he______ go to that coffee shop at the corner after workevery day.A.wouldB.shouldC.had betterD.might
9..Sir, you _____ be sitting in this waiting room.It is for women and children only.A.oughtn't toB.can't
C.won'tD.needn't
10.The fire spread through the hotel very quickly but everyone ______ get out.A.had toB.wouldC.couldD.was able to
11.--When can I come for the photos? I need them tomorrow afternoon.--They _____be ready by 12:00.A.canB.shouldC.mightD.need
12..--I stayed at a hotel while in New York.--Oh, did you? You_ ____with Barbara.A.could have stayedB.could stay
C.would stayD.must have stayed
13.－Will you stay for lunch?
－Sorry,＿＿＿＿＿ ,My brother is coming to see me.A.I mustn'tB.I can'tC.I needn'tD.I won't
14.Sorry I'm late.I ______ have turned off the alarm clock and gone back to sleep again.A.mightB.shouldC.canD.will
15.I should have been there, but I _______ not find the time.A.wouldB.couldC.mightD.should
16.My sister met him at the Grand Theatre yesterday afternoon, so he ___ your lecture.A.couldn't have attendedB.needn't have attended
C.mustn't have attendedD.shouldn't have attended
17.---Are you coming to Jeff's party?
---I'm not sure.I ________go to the concert instead.A．mustB．wouldC．shouldD．might
18.Mr.Bush is on time for everything.How _________ it be that he was late for the opening ceremony?
A．canB．shouldC．mayD．mustHe hesitated for a moment before kicking the ball, otherwise he ________ a goal.A．had scoredB．scored
C．would scoreD．would have scored
20.—Write to me when you get home.—_________
A．I mustB．I shouldC．I willD．I can
21.I was really anxious about you.You _____ home without a word.A.mustn't leaveB.Shouldn't have left
C.Couldn't have leftD.needn't leave
22.Oh, I’m not feeling well in the stomach, I______so much fried chicken just now.A.shouldn’t cutB.mustn’t have eaten
C.shouldn’t have eatenD.mustn’t eat
23.--I heard they went skiing in the mountains last winter.--It _____ be true because there was little snow there.A may not beB won’t beC couldn’t beD mustn’t be
24.It has been announced that candidates_____ remain in their seats until all the papers have been
collected.A canB willC mayD shall
25.A left-luggage office is a place where bags ______ be lefe for a short time, especially in a
railway station.A.shouldB.canC.mustD.will
26.---I don't mind telling you what I know.A.mustn'tB.may notC.can'tD.needn’t
27.I often see lights in that empty house.Do you think I _____ report it to the police?
A.shouldB.mayC.willD.can
28.Mr.White _____ at 8:30 for the meeting, but he didn’t’ show up.A.should have arrivedB.should arrive
C.should have had arrivedD.should be arriving
29.You ______ be tired-you've only been working for an hour.A.must notB.won' tC.can' tD.may not
30.— Who is the girl standing over there ?
— Well , if youknow , her name is Mabel.A.mayB.canC.mustD.shall
Keys:
1-5 ABCCA6-10DCAAD 11-15 BABAB16-20ADADC 21-25 BCCDB26-30 DAACC
第三篇：高中英语情态动词练习
高中英语情态动词练习
1.He ______ you more help, even though he was very busy.A.might have givenB.might give C.may have givenD.may give
2.Jenny______ have kept her word.I wonder why she changed her mind.A.mustB.shouldC.need D.would
3..-Could I borrow your dictionary?
-Yes, of course you_________
A.mightB.will C.canD.should
4.I told Sally how to get here, but perhaps I ______ for her.A.had to write it outB.must have written it out
C.should have written it out D.ought to write it out
5.—Shall I tell John about it?
—No, you ______.I've told him already.A.needn'tB.wouldn't
C.mustn'tD.shouldn't
6.─There were already five people in the car but they managed to take me as well.─ It______ a comfortable journey.A.can't beB.shouldn't be
C.mustn't have beenD.couldn't have been
7.It's nearly seven o'clock.Jack______ be here at any moment.A.mustB.needC.should D.can
8..When he was there, he______ go to that coffee shop at the corner after workevery day.A.wouldB.shouldC.had betterD.might
9..Sir, you _____ be sitting in this waiting room.It is for women and children only.A.oughtn't toB.can't
C.won'tD.needn't
10.The fire spread through the hotel very quickly but everyone ______ get out.A.had toB.wouldC.couldD.was able to
11.--When can I come for the photos? I need them tomorrow afternoon.--They _____be ready by 12:00.A.canB.shouldC.mightD.need
12..--I stayed at a hotel while in New York.--Oh, did you? You_ ____with Barbara.A.could have stayedB.could stay
C.would stayD.must have stayed
13.－Will you stay for lunch?
－Sorry,＿＿＿＿＿ ,My brother is coming to see me.A.I mustn't B.I can't C.I needn't D.I won't
14.Sorry I'm late.I ______ have turned off the alarm clock and gone back to sleep again.A.mightB.shouldC.canD.will
15.I should have been there, but I _______ not find the time.A.wouldB.couldC.mightD.should
16.My sister met him at the Grand Theatre yesterday afternoon, so he ___ your lecture.A.couldn't have attendedB.needn't have attended
C.mustn't have attendedD.shouldn't have attended
17.---Are you coming to Jeff's party?
---I'm not sure.I ________go to the concert instead.A．mustB．wouldC．shouldD．might
18.Mr.Bush is on time for everything.How _________ it be that he was late for the opening ceremony?
A．can B．shouldC．mayD．mustHe hesitated for a moment before kicking the ball, otherwise he ________ a goal.A．had scored B．scored
C．would score D．would have scored
20.—Write to me when you get home.—_________
A．I mustB．I shouldC．I willD．I can
21.I was really anxious about you.You _____ home without a word.A.mustn't leaveB.Shouldn't have left
C.Couldn't have leftD.needn't leave
22.Oh, I’m not feeling well in the stomach, I______so much fried chicken just now.A.shouldn’t cutB.mustn’t have eaten
C.shouldn’t have eatenD.mustn’t eat
23.--I heard they went skiing in the mountains last winter.--It _____ be true because there was little snow there.A may not be B won’t be C couldn’t be D mustn’t be
24.It has been announced that candidates_____ remain in their seats until all the papers have
been collected.A can B will C may D shall
25.A left-luggage office is a place where bags ______ be lefe for a short time, especially in
a railway station.A.shouldB.canC.mustD.will
26.---I don't mind telling you what I know.---You.I'm not asking you for it.A.mustn'tB.may notC.can'tD.needn’t
27.I often see lights in that empty house.Do you think I _____ report it to the police?
A.shouldB.mayC.willD.can
28.Mr.White _____ at 8:30 for the meeting, but he didn’t’ show up.A.should have arrivedB.should arrive
D.should be arriving C.should have had arrived
29.You ______ be tired-you've only been working for an hour.A.must notB.won' tC.can' tD.may not
30.— Who is the girl standing over there ?
— Well , if youknow , her name is Mabel.A.mayB.canC.mustD.shall
Keys:
1-5 ABCCA6-10 DCAAD11-15 BABAB16-20 ADADC21-25 BCCDB26-30 DAACC
第四篇：2014年最新情态动词专项练习
江苏省淮安中学高一II部英语情态动词专项练习编制人：郭琪审核人：秦芬
have done the research on his own.A.canB.mustC.wouldD.need
2.It ______ be the vocabulary that caused you the problem in the exercise because you know a lot of words.A.mayB.couldn'tC.shouldD.needn't
3.He ________ sleep, although he tried to, when he got on such a hunt for an idea until he had caught it.A.wouldn'tB.shouldn'tC.couldn'tD.mustn't
4.The childrenin the woods;otherwise, they would have been at the lakeside camp as scheduled.A.must have gotB.must getC.should have gotD.should get
5.Days later, my brother called to say he was all right, but say where he was.A.mustn'tB.shouldn'tC.wouldn'tD.mightn't
6.We ________ have bought so much food now that Suzie won't be with us for dinner.A.may notB.needn'tC.can'tD.mustn't
7.Mr.Smith is on time for everything.Howhe be late for the ceremony?
A.willB.canC.shallD.may
8.As I was sitting down for dinner, the telephone
A.shouldB.mustC.could
9.—I promise Shirleyget a new iPad on her birthday.—Will it be a big surprise to her?
A.willB.wouldC.should
10.—I turn on the TV for you, Grandpa?
—Yes, thanks a lot, my dear.You’re so considerate.D.wouldD.shall
A.MayB.ShallC.WillD.Need
11.—It's eight o'clock already.Jack _______ be here by now.—Oh, he told me that he was going to see his dentist and wouldn't be back until ten.A.mustB.canC.shouldD.need
12.—I had a very boring weekend at home.—Why did you stay at home? Youwith us.A.might hikeB.could have hikedC.should hikeD.must have hiked
13.—These days I am even sleepy in class.—How terrible it is!Youas well go to bed earlier.A.shouldB.willC.canD.may
14.Overloaded with work, school teachers now get far less sleep than they ______.A.shallB.shouldC.mayD.might
15.—Did you attend the opening ceremony of The Voice of China last week?
—Sorry!We ________ it, but we had a terrible traffic accident on our way.A.must have attendedB.must attendC.could have attendedD.could attend
江苏省淮安中学高一II部英语情态动词专项练习编制人：郭琪审核人：秦芬
16.I ______ myself more----it was a perfect day.A.shouldn‘t have enjoyedB.needn‘t have enjoyed
C.wouldn‘t have enjoyedD.couldn‘t have enjoyed
17.-----How did you do in the test?
-----Not so well.I ______ much better but I misread the directions for Part D.A.could have doneB.could doC.must have doneD.should do
A.might have failedB.could have failed
C.should have failedD.must have failed
19.—Mother, I climbed up to that tall tree and picked this big apple.—Jesus!You______ down and hurt yourself.A.might have fallenB.might fallC.must have fallenD.must fall
20.— I phoned you yesterday morning.A girl answered, but I didn’t recognize the voice.— Oh, it ____ my younger sister.She was in my room at that moment.A.must have beenB.should have beenC.could have beenD.may have been
21.— Can I pay the bill by check?
— Sorry, sir.According to the rules of our hotel, the payment ______ be made in cash.A.shallB.needC.willD.can
22.---Do you know where David is? I couldn’t find him anywhere.---Well.He ______ have gone far — his coat’s still here.A.needn’tB.can’tC.mustn’tD.wouldn’t
23.The new law states that people ________ drive after drinking alcohol.A．wouldn'tB．needn'tC．won'tD．mustn't
24.—Shall I inform him of the change of the schedule right now?
—I am afraid you ________, in case he comes late for the meeting.A．willB．mustC．mayD．can
25.The door ________ open, no matter how hard she pushed.A．shouldn'tB．couldn'tC．wouldn'tD．mightn't
26.—I left my handbag on the train, but luckily someone gave it to a railway official.—How unbelievable to get it back!I mean, someone ________it.A．will have stolenB．might have stolenC．should have stolenD．must have stolen
27.—John looks a bit upset.Did you tell him the bad news?
—Yes, but I ________ him after his birthday party.A．should have toldB．must have toldC．shouldn't have toldD．needn't have told
28.—Where ________ Mary have put the empty bottles?
—She ________ them away.They must be somewhere.A．can;can't have thrownB．must;needn't
C．must;must have thrownD．can;mustn't have thrown
29.I ________ thank you too much for all your help to my son while we were away from home.A．won'tB．can'tC．canD．will
30.Peter _____ be really difficult to get along with at times even if he’s a nice person in general.A.shallB.shouldC.canD.must
第五篇：2014届高三英语语法讲解——情态动词
情态动词
概述：情态动词表示说话人的情感态度。它有一定的实在词义（如：能、会、可能、以前、最好、宁愿），只有谓语特性，必须和其他动词一起构成谓语。
例如：+be done
+be doing
must+have done
+have been done
+have been doing
注意：和used(to)例外，动词不定式要带上”to”
一、情态动词的用法：
1．can
1）表示能力“能够，会”
She can drive, but she can’t ride a bicycle.Can you give me a lift to the station?
2）表示对现在动作或状态进行主观的猜测“可能、会”，或表示惊异，怀疑，不相信等态度，主要用在否定句、疑问句或感叹句中。例如：
He can’t have a lot of money.Can it be that it was I, not he, who was mistaken?
How can you be so careless!
3）表示客观可能性“可能”，可用于肯定句
As a human being, anyone can make a mistake.The temperature can fall to-60°C that is 60°C below freezing.4）表示允许“可以”，意思与may 相近，主要用在口语中
Can I have a look at your copy of China Daily?
This sort of thing can’t go on.5）构成下列特殊句式：
①cannot /can never …too … 或 cannot …enough越…越好；非常．．．．．．
One cannot be too careful.I cannot thank you enough.You can’t praise him too highly.②cannot help doing …/cannot help but do …/cannot but do …禁不住；不由得；不得不 I cannot help admiring the picture whenever I look at it.When a close friend dies, you cannot but feel sad.2.could
1)表示能力,指的是过去时间
In those days few workers could support their family.I couldn’t follow the teacher in class.2)表示允许,指的是过去时间
She asked whether she could take the books out of the reading-room.3)表示可能,可以指过去时间;也可以指现在时间,表示语气缓和
I didn't think the story could be true.But you mustn’t smoke while you’re walking around in the bush either.You could start a fire.He looks young.He couldn’t be over fifty.他看起来很年轻,他不可能超过五十岁.4)比较委婉客气地提出问题或陈述看法,指的是现在时间
Could I see your license?
I have a few friends.I could ring to see if they’re free.Can(could)与be able to
Can(could)和be able to表示能力时意思上没有区别.但can 只有现在式和过去式,而be able to 则有更多的形式.No one is able to do it.= No one can do it.Will you be able to come tonight?
I’m sorry I haven’t been able to answer your letter.She said she had not been able to come earlier.但是,在表示成功地完成某一具体动作时用be able to 来表示。这时,be able to相当于managed
to 或succeeded in doing ,表示经过一番努力，终于能够……。例如：
1）Were able to escape
people2）Managed to escapeinto the street.3）succeed in escaping
3．May
1)表示许诺“可以”或询问、说明一件事。
注意：回答may 引起的问句时，否定形式用must not(禁止)，had better not(最好别)。
May I trouble you with a question?
—Could I call you by your first name ?
—Yes, you may./No, you mustn’t./No, you’d better not.2).表示表示主观的推测“或许”，通常用在肯定句和否定句中。例如：
He may be very busy now.He may not be at home.注意：表示可能性时，can’t 语气强表示“不可能”；may not 语气弱，表示“可能不（或许）”。
4．might
1)表示可以做的事，指的是过去时间
He asked if he might look through my album.2）表示口气比较婉转客气，指的是现在时间
Might I ask for a photograph of your baby?
I wonder if I might borrow some coffee.3）表示可能发生的事，可以指过去时间；也可以指现在时间，但表示语气更加不肯定
She was afraid they might not like the idea.They might have a lot of work to do now but I’m not sure.5．must
1)表示必须要做的事，否定表示“禁止”
We mustn’t move someone if they are badly hurt.如果一个人受了重伤，你一定不要挪动他。注意：在回答由must 引起的问句时，如果是否定回答，不能用mustn’t ,而要用needn’t 或don’t have to ,因为mustn’t 是“不准、禁止”的意思。
--Must we send in our plan this week?--Yes ,you must.。
--No, you needn’t./ No, you don’t have to.2）表示猜测，意为“想必，准是，一定”，只用于肯定句中
This must be your room.Look at his new car.He must have a lot of money.3)表示讨厌情绪“偏偏”
I am sleeping when you must turn your radio on.注意：have to 表示“必须”，“不得不”，在这个意义上与must 很接近，但must 表示的是说话人的主观看法，而 have to表示的却是客观需要。另外，have to比must 有更多的形式。You must be back by ten.（命令或叮嘱）
You have to be back by ten.（客观需要）
We had to go home on foot.我们不得不走回家。
6．should和ought to “应该”
1)表示应该做的事，should 和 ought to 一般可以通用。但ought to 语气更强些，强调“有责任，有义务做”或“按道理应该如何”；should 含有“劝告、建议”的语气，即“按我的想法应该如何”。试比较
--I’ll start the work tomorrow.我明天开始这工作。
--Ｉthink you should start at once./ No, you ought to start at once.不行，你得立即开始。
2）表示推测，意为“想必一定，照说应该，估计”。should 和 ought to 在这一意义上含义比must 弱。试比较
Mr.Black must be home by now.（肯定）
Mr.Black ought to(should)be home by now.（不能肯定）
7．shall
1)用于第一、三人称，构成疑问句，表示征求对方意见或请求指示
Shall I open the window?
Shall the boy wait outside?
2)用于第二、三人称，表示说话人的意愿，表示“命令、警告、威胁、强制、允诺、决心” You shall do as I say.（命令）
Tell him that he shall have the book tomorrow.（允诺）
If you children don’t do as I tell you, you shall not go to the party.（威胁）
You shall be sorry for what you did.对你的所作所为你会感到后悔的。（警告）
Nothing shall stop us from carrying out this plan.什么也不能阻止我们实现这项计划。（决心）
8．will
1)表示“意志，意愿”，可用于多种人称 I will do anything for our soldiers.If you will read the book, I will lend it to you.如果你愿意读这本书，我会把它借给你。
注意：从句中的will 是情态动词，表示“意愿”；主句中的will 是助动词，帮助构成将来时。
2）will 在疑问句中用于第二人称，表示询问对方的意愿或向对方提出请求
Will you open the door for me, please?
Pass me the glass, will you?递给我杯子，好吗？
有时，这种句子也可以是won’t you have a little more rice ?
3）表示某种倾向或习惯性动作，意为“总是会，老是，就是”；否定结构意为“不肯、不能”。这种用法并不指将来时间，因此，不能与表示将来时间的状语连用
Some birds will fly south when winter comes.Boys will be boys.They are always naughty.What’s the matter with the door? It won’t lock.9．would
1)是will 的过去式，表示过去时间的“意志、意愿”，可用于多种人称
They said that they would help us.2）would指的是现在时间，表示说话人的意愿或向对方提出请求，语气比will 婉转。也可表示委婉地提出看法、请求、建议等
I would like to have a try.我想试试。
Would you like me to carry it for you? 我帮你拿这个好吗？
3）表示反复发生的动作或过去的一种倾向
He told me the box wouldn’t open.他告诉我盒子就是打不开。.used to
在肯定句中，used to 表示过去（曾经）的动作或状态，现在“已不”.I used to get along very well with my cousin and we used to be very good friends.Did you use to go to the same school?
I didn’t use to smoke.John used to be a policeman, didn’t he?
Did you use to take a walk in the morning?
used to 常用来表示表示已不复存在的过去的习惯，侧重与现在的对比，而would用来表示过去反复发生的动作。
He would go to that bookstore when he was at college.他在上大学时经常去那个书店。
11． need
need 作为情态动词，主要用于否定句，疑问句中。在肯定句中一般为行为动词
Need he do it all at once? 他需要马上做这件事吗？
Why need you go today? 为什么你今天需要去？
I wonder if I need bring my computer.我想知道我是否需要带上电脑。
注意：回答由need 引起的问句时，肯定回答一般用must ,否定回答时用needn’t.--Need I give you the book?
--Yes ,you must.--No ,you needn’t.need 用作及物动词，和不定式连用，可用于各种结构。
Does he need to know it?
The question needs to be discussed.这问题需要讨论。
12.dare(dared)
dare及其过去式dared 作为情态动词，主要用于疑问句、否定句和条件状语从句中。Dare you go home alone?
She dare not say what she thinks.除了在I dare say … 这种习惯用语中，dare 在肯定结构中用作情态动词的情形是很少的。I dare say my uncle will do that.dare 还可以作及物动词，跟不定式，用于各种结构。否定句中to 可以省略。
We must dare to act.I did not dare(to)look up.我不敢抬头看。
二、情态动词的完成式（表示已经发生的情况和表示虚拟语气）
1、must have+过去分词，表示对已发生情况的肯定推测
My pen must have apparent the moment I walked into the room.2、can’t / couldn’t have+过去分词，表示对已发生情况的否定推测
Mary can’t have received my letter;otherwise she would have replied before now.3、may / might have +过去分词，表示对已发生的事情做不肯定的推测
A potentially serious leakage of radioactive water may have been caused by an electrician.4、needn’t have + 过去分词，表示做了不必做的事，相当于“didn’t need to do” As it turned out to be a small house party, we needn’t have dressed up so formally.5、should have +过去分词，表示应该做某事但实际上未做
I should have planned everything ahead carefully.6、could have +过去分词，表示过去本来可以做但却未做
You could have phrased it more tactfully7、may/ might have +过去分词，表示过去可以做但实际未做
It might have been better to include more punchy statistics and photos of equipment in the introduction to further assist first-time office automation managers.三、其他
情态动词must ,can/could ,may /might表推测句子的反义问句的构成。要先将情态动词去掉按照常规句子的方式进行变换。例如：
He must be working in the office now, isn’t he?
Tom may have missed the bus again, hasn’t he?
Jack can’t have arrived this morning, did he?
如果是祈使句，则都变成 will sb？
情态动词DCDAA CBBDB CBBB
虚拟语气补充DBCAA BCDDA CDADA BBDAB
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