情态动词专项

第一篇：情态动词专项

情态动词专项

1.can

①（表能力）能…，会…

She can drive, but she can’t ride a bike.A computer can’t think for itself.(不会思考)

②（可能，许可）能够…，可以…

The noise outside has stopped , now I can get down to my study.--Can I use your telephone?--Yes, of course, you can.You can go out to play when you do away with your homework.③有时会…，偶尔…，The climate of East China can be pretty cold in winter.Jogging can be harmful for the health.Even experienced teachers can make mistakes.London could be rather cold in summer while I stayed there.④（表温和的命令）请做…，得…

I’ll do the cooking, and you can do the washing.（请你去洗衣服）

You can go now.⑤（表示猜测）可能…

Can he be working till so late?

Who can it be at this time of day?

Can it be Tom? No, it can’t be Tom.He is busy these days, so he can’t come today.can 与be able to 的区别：

The fire spread through the hotel very quickly, but everyone was able to get out.(强调设法干成某事)

2.shall

⑪用于一三人称的问句中，表示征求对方的意见

Shall I shut the window? Yes, please.Shall she go to the concert with us this evening?

Shall they come in?

Shall we go out for a walk?

⑫用于二三人称，表示命令，允诺，警告，威胁，强制

①You shall go to the front at once.(命令)

②Don’t worry.You shall get the answer this afternoon.（允诺）

③I promise she shall get a nice present on her birthday.（允诺）

④He shall be punished.威胁

⑤You shall listen to me.(命令)

⑥The interest(利益利润)shall be divided into five parts, according to the agreement made by both sides.(命令法规)

⑦It has been announced that candidates(候选人)shall remain in their seats until all the papers have been collected.（表按规定）

3.must

⑪必须

I must keep my word.You must get up much earlier.⑫不必needn’t/don’t have to

--Must I wash the dishes at once?

--No, you needn’t./don’t have to.⑬mustn’t 禁止，不许

You mustn’t play with the knife.Cars mustn’t be parked here.--May I use your pen?

--No, you mustn’t

⑭（表必然性）必定

Everyone must die.⑮（表固执，不满等）偏要硬要

Our there-year-old boy must do the opposite to what we ordered.Just when I was busy, the neighbor must come and chat.Why must you be so stubborn(倔强的)?

If you must know, I’m going to help him look for an apartment.4.should

⑪ 应该

You should apologize to him.We should attend the meeting.⑫（表预期）按理会…，想必会…，一定会…

The concert should be great fun.The photos should be ready by 12:00.The old man is always hunting the lions, so terrible things should happen to him.⑬（表惊讶，遗憾）竟然居然

I’m glad that your story should speak in such a way.I wonder that a person like him should make such a mistake.It’s a pity that he should resign.⑭（用于条件状语从句中）一旦，万一

If she should know the truth, she would be depressed.If you should change your mind, let us know.Ask him to call me up if you should see him.⑮（用于lest, for fear that, in case引导的句子）以免，唯恐

She gave me a list just in case I should forget what to buy.He ran away lest he should be caught.He gets up early for fear that he should miss it.5.would

①(表过去的习惯行为)常常经常

When I was a child, I would often go skiing.We would stay up all night talking about our future.Every morninghe would go for a walk.When he was here, he would go to that coffee shop at the corner after work everyday.区别used to do sth过去常常

I use to be a waiter, but now a taxi driver.There used to be a cinema here before the war.Our country isn’t what it used to be.②（表示说话者的厌烦焦躁）老是偏要

That’s exactly like Susie.She would come to me just when I was busy.(老是在我忙碌时来找我)

I told him not to go, but he would not listen.（可他偏不听）

③（用于if 从句）愿意乐意

If you would go there instead of me, I should be very glad.如果你愿意代替我去那儿，我会很高兴的。

You could win if you would try要是你愿意尝试，你会赢的④（用于否定句中，主语一般是事物，表某事物暂时的特性）就是不能 That window wouldn’t open.That morning my car wouldn’t start.When I called on him this morning, his dog wouldn’t let me in.The door won’t open.The car won’t start.The doctor knows I won’t be operated on.⑤（表示推测）大概，大约

That would be his father.那大概设他父亲。

You would be about 10 years old then.你那时大概10岁。

It would be about ten when they left.I thought she would have told you about it.6.需特别注意：

①may well do sth =be very likely to do sth(很可能，完全能)

may as well do sth = had better do sth

② would like to have done

= would love to have done

= was/were to have done(本来想做…，本来打算做…)

③ had better have done sth（当时已做了…就好了）

④ must have done sth（肯定干过某事）

⑤ can have done sth可能已干过…

can’t have done sth不可能干过…，肯定没干过…

⑥could have done sth本来能够干 …，可能已干过…

⑦ may /might have done sth也许已经干过…，⑧should have done sth

=ought to have done sth本来应该干…

⑨needn’t have done sth本不必做…

⑩would rather have done sth宁愿干过…

would rather not have done sth宁愿没干过…

好成绩是练出来的：

1.A left –luggage office is a place where bags ____ be left for a short time , especially at a railway station.A shouldB canC must D will

2.How ___ you say that you really understand the whole story if you have covered only part of the article?

A canB mustC needD may

3.--There’s no light on.--they ___ be at home.A can’tB mustn’tC needn’tD shouldn’t

4.Some aspects of a pilots job ___ be boring ,and pilots often ___ work at in convenient hours.A can, have toB may, canC have to, mayD ought to, must

5.He didn’t agree with me at first, but I ____ persuade him to sign the agreement later.A couldB mightC ought to Dwas able to

6.If I ____ plan to do anything I wanted to, I’d like to go to Tibet and…

A wouldB couldC had toD ought to

7.The World Web is sometimes jokingly called the World Walt because it ___ be very slow.A shouldB mustC will D can.8.—Is Jack on duty today?

--It ___ be him.It’s his turn tomorrow.A can’tB mustn’tC needn’tD won’t

9.I____ have been more than six years old when the accident happened.A couldn’tB mustn’tC needn’tD shouldn’t

10.—I have taken someone else’s green sweater by mistake.--It ___ Harry’s.He always wears green.A has toB will beC must beD could be

11.You ____ be tired , you have only been working for an hour.A can’tB mustn’tC may notD won’t

12.—Do you know where David is ?I couldn’t find him anywhere.--Well, he ___ have gone far.His coat is still here.A can’tB mustn’tC may notD won’t

13.—Can I pay the bill by check?

--Sorry, sir.But it is the payment shall be made in cash.A shallB mustC will D can.14.—Could I have a word with you, mum?

--Oh, dear, if you ____.A shouldB mustC may D can.15.Naturally, after I told her what to do, my daughter ___ go and do the opposite.A shouldB mustC may D can.16.—Who is the girl standing over there?

--Well, if you ___ know, her name is Mabel.A shallB mustC may D can.17.John, look at the time.___ you play the piano at such a late hour?

A NeedB MustC May D Can.18._____ you need any help, you can phone me at the office.A WouldB ShouldC CouldD Had

19.—I’m afraid I will be too busy to go with you.--Well, I’ll keep a seat for you in case you ___ change your mind.A shouldB mayC will D can.20.If anything __ happen to me, please give this letter to my head teacher.A couldB mustC wouldD should

21.There is a real possibility that these animals could be frightened, ____ a sudden loud noise.A being thereB should there beC there wasD there having been

22.—When can I come for the photos? I need them tomorrow afternoon.--They ___ be ready by 12:00.A shouldB mightC need D can.23.It’s nearly seven o’clock.Jack ___ be here at any moment.A shouldB mustC need D can.班级________姓名_____________

1-5 ___________________2-10___________________11-15_________________

16-20__________________21-23_______

第二篇：高三情态动词专项

高三情态动词专项

1.Some people who don’t like to talk much are not necessarily shy;they___ just be quiet people.A.must B.may C.should D.would

2.—Why____you be talking so loudly while others are studying?

–--I am terribly sorry.A.shall B.must C.will D.may

3.—Where will you start your work after graduation?

—Um,it’s not been decided yet.I_____continue my study for a higher degree.A.must B.need C.would D.might

4.--___it be Tom that stole the manager’s mobile phone?

---No,as far as I know,Tom is very honest.A.May B.Can C.Must D.Should

5.Traffic safety is so important that everyone___take safety measures too seriously.A.shouldn’t B.mustn’t C.cannot D.won’t

6.Peter____be really difficult at times even though he’s a nice person in general.A.shall B.should C.can D.must

7.You can’t imagine that a well-behaved gentleman_____be so rude to a lady.A.might B.need C.should D.would

8.---The work will take me another week.I’m really tired.—I think you___ as well go to ask an experienced worker for some advice.A.may B.can C.need D.must

9.—That must be a mistake.—No,it_____a mistake.A.must not beB.needn’t be C.cannot be D.would not be

10.He was a good runner so he__ escape from the police.A.might B.succeeded to C.would D.was able to

11.A dog ran in front of my mother’s car and she___ stop very quickly.A.ought to B.had better C.must D.had to

12.I didn’t hear the phone.I____asleep.A.must be B.should be C.must have been D.should have been

13.---I saw Mr Sun at Tongyu Station this morning.—You____.He’s still on holiday in Hawaii.A.couldn’t have B.mustn’t have C.shouldn’t D.needn’t

14.--What has happened to George?

—I don’t know.He____lost.A.can have got B.may have got C.might get D.could get

15.Many people___to his home as he keeps a big dog.A.not dare go B.dare not go C.not dare to go D.dare not to go

16.I don’t think he could have done so much homework last night,____?

A.do I B.could he C.has he D.did he

17.You ___late for yesterday’s class meeting,as it was so important.A.couldn’t be B.shouldn’ t beC.mustn’t have been D.oughtn’t to have been

18.—The Chinese athletes did extremely well in the Olympics.—Yes,they____well,or they____ such great achievement.A.must have been trained;couldn’t have gotB.must have trained;could have got

C.must have been trained;mustn’t have gotD.should have trained;couldn’t have got

19.As you know,although there are no classes on weekends now,no students___go out of the schoolwithout the headteacher’s permission.A.will B.must C.may D.shall

20.Many women___ a good salary,but they chose to stay at home for the family.A.must make B.must have made C.should make D.could have made

21.—Why hasn’t Mr.Green showed up at the meeting yet?

—I’m not sure,but he___ in a traffic jam driving here.A.could be caughtB.might be caughtC.might have been caught D.must have caught

第三篇：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

第四篇：高考情态动词

2000 ~ 2005 年高考题汇编

情 态 动 词

1.Sorry I'm late.I ________ have turned off the alarm clock and gone back to sleep again.（2000北京春季）（A）

A.mightB.shouldC.canD.will

2.I was really anxious about you.You_________ home without a word.（01全国）（B）

A.mustn’t leaveB.shouldn’t have leftC.couldn’t have leftD.needn’t leave

3.— Write to me when you get home.— _________（01北京春季）（C）

A．I mustB．I shouldC．I willD．I can

4.— Is John coming by train?

— He should, but he _________ not.He likes driving his car.（02全国）【Ｄ】Ａ．mustＢ．canＣ．needＤ．may

5.― I heard they went skiing in the mountains last winter.― It ______ true because there was little snow there.（02北京）（C）

A.may not beB.won’t beC.couldn’t be

D.mustn’t be 6.— I hear you’ve got a set of valuable Australian coins — Yes, certainly.（02北京春季）（B）I have a look?

A.DoB.MayC.ShallD.Should

7.A left luggage office is a place where bagsbe left for a short time, especially at a railway station.（03全国卷）（B）

A．should B．can C．must D．will

8.— The room is so dirty.we clean it?

— Of course.（03北京春季）（B）

A．Will B．Shall C．Would D．Do

9.---Who is the girl standing over there?

---Well, if you______ know, her name is Mabel.（04天津）(C)

A may B can C must D shall

10.“The interestbe divided into five parts, according to the agreement made by both sides,” declared the judge.（04重庆）(D)

A.may B.should C.must D.shall

11.---I don't mind telling you what I know.---Y.I'm not asking you for it.（04江苏）(D)

A.mustn'tB.may notC.can'tD.needn’t

12.I ____ pay Tracy a visit, but I am not sure whether I will have time this Sunday.（04浙江）(A)

A.shouldB.mightC.wouldD.could

13.---I’ll tell Mary about her new job tomorrow.---You________ her last week.（04福建）(D)

A．ought to tell B．would have told C．must tell D．should have told

14.I often see lights in that empty house.Do you think I _____ report it to the police?（04广西）（A）

A.shouldB.mayC.willD.can

15.Mr.White _____ at 8:30 for the meeting, but he didn’t’ show up.（04广西）（A）

A.should have arrivedB.should arrive

C.should have had arrived D.should be arriving

16.---Excuse me, but I want to use your computer to type a report.---You ______ have my computer if you don't take care of it.（04湖南）（A）

A.shan't B.might notC.needn'tD.shouldn't

17.— Excuse me.Is this the right way to the Summer Palace?

— Sorry, I am not sure.But it be.（04湖北）(A)

A．mightB．will C．mustD．can

18.---Mum, I’ve been studying English since 8 o’clock..I go out and play with Tom

for a while?

---No, I’m afraid not.Besides, it’s raining outside now.（04辽宁）(A)

A．Can’tB．Wouldn’tC．May notD．Won’t

19.Children under 12 years of age in that country ________ be under adult supervision when is a

public library.（04上海）(A)

A.mustB.mayC.canD.need

20.---Isn’t that Ann’s husband over there?

---No, it______ be him---I’m sure he doesn’t wear glasses.（04全国I）(A)

A can’t B must not C won’t D may not

21.You ______ be tired---you’ve only been working for an hour.（04全国II）(C)

A must not B won’t be C can’t D may not

22.---Tom graduated from college at a very young age.---Oh, he______ have been a very smart boy then.（04全国IV）（D）

A could B should C might D must

23.You might just as well tell the manufacturer that male customers _______ not like the design of the furniture.（04上海春季）（C）

A.mustB.shallC.mayD.need

24.He __________ have completed his work;otherwise, he wouldn’t be enjoying himself by the

seaside.(05北京卷)(B)

A.shouldB.mustC.wouldn’tD.can’t

25.He paid for a seat, when he ______ have entered free.（05山东卷）(A)

A.couldB.wouldC.mustD.need

26.---I've taken someone else's green sweater by mistake.---It ______ Harry's.He always wears green.(05广东卷)(D)

A.has to beB.will beC.mustn't beD.could be

27.— Do you know where David is? I couldn’t find him anywhere.— Well.Hehave gone far—his coat’s still here.（05湖北卷）(C)

A．shouldn’t B．mustn’t C．can’t D．wouldn’t

28.If Iplan to do anything I wanted to, I’d like to go to Tibet and travel through as much

of it as possible.（05湖北卷）(B)

A．would B．could C．had to D．ought to

29.---Lucy doesn’t mind lending you her dictionary.---She ______.I've already borrowed one.（05湖南卷）(C)

A.can'tB.mustn'tC.needn'tD.shouldn't

30.The more I think about him, the more reasons I find for loving him ___ I did.（05湖南卷）(A)

A.as much asB.as long asC.as soon asD.as far as

31.— Tom is never late for work.Why is he absent today?

— Something ________ to him.(05江西卷)(D)

A．must happenC．could have happened B．should have happened D．must have happened

32.John, look at the time._______ you play the piano at such a late hour?（05全国卷3）(B)

A．Must B．Can C．May D．Need

33.Tom, youleave all your clothes on the floor like this!（05全国卷1）(B)

A．wouldn’tB．mustn’tC．needn’tD．may not

34.There _________ be any difficulty about passing the road test since you have practiced a lot in the driving school.（05上海卷）(C)

A.mustn’tB.shan’t C.shouldn’t D.needn’t

35.The World Wide Web is sometimes jokingly called the World Wide Wait because it

_________be very slow.（05浙江卷）(D)

A．should B．mustC．willD．can

36.I was on the highway when this car went past followed by a police car.They ____ at least 150

kilometers an hour.（05重庆卷）(B)

A.should have been doingB.must have been doing

C.could have doneD.would have done

37.I _______have been more than six years old when the accident happened.（05天津卷）(B)

A.shouldn'tB.couldn'tC.mustn'tD.needn't

38.Helen ______ go on the trip with us, but she isn’t quite sure yet.（05安徽卷）(C)

A.shallB.mustC.mayD.can

39.This cake is very sweet.You __________ a lot of sugar in it.（05辽宁卷）(D)

A．should put B．could have put C．might put D．must have put

40.---The woman biologist stayed in Africa studying wild animals for 13 years before she

returned.---Oh, dear!She _______ a lot of difficulties!(05江苏卷)(D)

A.may go throughB.might go through

C.ought to have gone throughD.must have gone through

41.I have lost one of my gloves.I ________ it somewhere.（05北京春季）（B）

A.must drop B.must have dropped

C.must be dropping D.must have been dropped

第五篇：情态动词教案

情态动词

【考纲解读】

情态动词与虚拟语气有千丝万缕的联系，它们往往放在一起考查。在近年高考题中，对情态动词的考查几乎每年都有纵观近几年的高考题可以看出，高考对情态动词的考查热点依次是：（1）推测和可能性；（2）“情态动词+have done”结构表示猜测或表示虚拟语气；（3）shall, should, can, must表示特定语气。尤其是对“情态动词+have done”结构的考查频率较高。试题的情景设置往往生动、真实，但考查的角度趋于细微化和综合化，有效信息较为隐蔽，这就决定了情态动词题是难题之一。情态动词题每年都考，所以本专题在高考中的重要地位是显而易见的。因而在复习中应引起高度重视，且依笔者之见，来年高考中对情态动词考查的可能性依然非常大。【知识要点】

一、情态动词的语法特征

1.情态动词不能表示正在发生或已经发生的事情，只表示期待或估计某事的发生。2.情态动词 除ought 和have 外，后面只能接不带to 的不定式。3.情态动词没有人称、数的变化，即情态动词第三人称单数不加-s。4.情态动词没有非谓语形式，即没有不定式，分词等形式。

二、情态动词的基本用法 1.比较can 和be able to 1)can could 表示能力；可能(过去时用could)，只用于现在时和过去时(could)。be able to可以用于各种时态。

They will be able to tell you the news soon.他很快就能告诉你消息了。2)只用be able to中情况： 位于助动词后； 情态动词后；

表示过去某时刻动作时； 用于句首表示条件；

表示成功地做了某事时，只能用was/were able to，不能用could。He was able to flee Europe before the war broke out.=He managed to flee Europe before the war broke out.战争爆发前，他就逃离欧洲了。

注意：could，在否定，疑问句中表示推测或怀疑。表示提出委婉的请求（注意在回答中不可用could）。

—Could I have the television on? —Yes，you can./No，you can’t.He couldn’t be a bad man.他不大可能是坏人。2.比较may和might

1)表示允许或请求；表示没有把握的推测；may 放在句首，表示祝愿。May God bless you!愿上帝保佑你！He might be at home.他有可能在家。

注意：might 表示推测时，不表示时态。只是可能性比may 小。

2)may/might as well，后面接不带to 的不定式，意为“不妨，还是……好”。You may(might)as well tell me the truth.你还是对我说实话好。3.比较have to和must

1)两词都是“必须”的意思，have to 表示客观的需要，must 表示说话人主观上的看法，即主观上的必要。

My brother was very ill，so I had to call the doctor in the middle of the night.我弟弟病得很厉害，我只得半夜里把医生请来。(客观上需要做这件事)

He said that they must work hard.他说他们必须努力工作。（主观上要做这件事）

2)have to有人称、数、时态的变化，而must只有一种形式。

He had to look after his sister yesterday.昨天他不得不照看他的妹妹。3)在否定结构中：

don’t have to 表示“不必”（可以不可以都行）；mustn’t表示“禁止” You don’t have to tell him about it.你不必把此事告诉他。You mustn’t tell him about it.你一定不要把这件事告诉他。4.must表示推测

1)must用在肯定句中表示较有把握的推测，意为“一定”。

2)must表对现在的状态或现在正发生的事情的推测时，must 后面通常接系动词be 的原形或行为动词的进行式。

You have worked hard all day.You must be tired.你辛苦干一整天，一定累了。（对现在情况的推测判断）He must be working in his office.他一定在办公室工作呢。比较：He must be staying there.他现在肯定在那里。He must stay there.他必须待在那里。

3)must 表示对已发生的事情的推测时，must 要接完成式。I didn’t hear the phone.I must have been asleep.我刚才没有听到电话，我想必是睡着了。

4)must表示对过去某时正发生的事情的推测，must 后面要接不定式的完成进行式。—Why didn’t you answer my phone call?

—Well，I must have been sleeping，so I didn’t hear it.5)否定推测用can’t。

If Tom didn’t leave here until five o’clock，he can’t be home yet.如果汤姆五点才离开这儿，他此时一定还未到家。5.表示推测的用法

can，could，may，might，must 皆可表示推测，其用法如下： 1)情态动词+动词原形

表示对现在或将来的情况的推测，此时动词通常为系动词。I don’t know where she is，she may be in Wuhan.我不知道她在哪儿，她可能在武汉。2)情态动词+动词现在进行时

表示对现在或将来正在进行的情况进行推测。

At this moment，our teacher must be correcting our exam papers.这时，我们老师想必在批改试卷。

3)情态动词+动词完成时表示对过去情况的推测。

We would have finished this work by the end of next December.明年12月底前我们很可能已完成这项工作了。The road is wet.It must have rained last night.地是湿的，昨天晚上一定下雨了。

4)情态动词+动词的现在完成进行时表示对过去正在发生事情的推测。Your mother must have been looking for you.你妈妈一定一直在找你。

5)推测的否定形式，疑问形式用can’t，couldn’t表示。

Mike can’t have found his car，for he came to work by bus this morning.迈克一定还没有找回他的车，因为早上他是坐公共汽车来上班的。

注意：could，might表示推测时不表示时态，其推测的程度不如can，may。6.情态动词+have+过去分词

1)may(might)have+done sth.can(could)have+done sth.表示过去，推测过去时间里可能发生的事情。

Philip may(might)have been hurt seriously in the car accident.飞利浦在那场车祸中有可能伤的很严重。

2)must have+done sth.对过去时间里可能发生的事情的推测，语气较强，具有“肯定”“谅必”的意思。

—Linda has gone to work，but her bicycle is still here.—She must have gone by bus.3)ought to have done sth.／should have done sth.本应该做某事，而事实上并没有做。否定句表示“不该做某事而做了”。

He ought not to have thrown the old clothes away.（事实上已扔了。）ought to 在语气上比should 要强。4)needn’t have done sth.本没必要做某事 I dressed very warmly for the trip，but I needn’t have done so.The weather was hot.那次旅行，我穿的非常暖和，但我本没有必要那么去做。天太热了。5)would like to have done sth.本打算做某事

I would like to have read the article，but I was very busy then.我本想读那本书，但我那时太忙了。7.should 和ought to

should 和ought to 都为“应该”的意思，可用于各种人称。—Ought he to go?

—Yes.I think he ought to.表示要求，命令时，语气由 should（应该），had better最好），must（必须）渐强。8.had better表示“最好”

had better 相当于一个助动词，它只有一种形式，它后面要跟动词原形。had better do sth.最好干某事

had better not do sth.最好不干某事

had better have done sth.表示与事实相反的结果，意为“本来最好”。9.would rather表示“宁愿” would rather do 宁可干某事

would rather not do 宁可不干某事 would rather...than...宁愿……而不愿

还有would sooner，had rather，had sooner都表示“宁愿”“宁可”的意思。I would rather stay here than go home.=I would stay here rather than go home.我宁可待在这儿也不回家。

10.will和would

1)would like；would like to do=want to 想要，为固定搭配。Would you like to go with me?你想和我一块儿去吗？

2)Will you...? Would you like...?表示肯定含义的请求劝说时，疑问句 中一般用some，而不是any。

Would you like some cake?要蛋糕吗？

3)否定结构中用will，一般不用would，won’t you是一种委婉语气。Won’t you sit down?你不坐吗? 11.情态动词的回答方式

must和need相同:Yes,...must.No,...needn't/don't have to may和can could相同:Yes,...may/can/could.No,...mustn't/...'d better not/can't.shall:Yes,...can/may.No,...can't.should:Yes,...should.No,...shouldn't.will和would差不多:Yes,...do/will.No,...won't/thanks.典型例题

1）---Could I borrow your dictionary?---Yes,of course,you____.A.might B.will C.can D.should 答案C.could表示委婉的语气,并不为时态.答语中of course,表示肯定的语气,允许某人做某事时,用can和 may来表达,不能用could或might.复习：will 与you连用,用来提出要求或下命令.should与you 连用,用来提出劝告.2）---Shall I tell John about it?---No,you ___.I've told him already.A.needn't B.wouldn't C.mustn't D.shouldn't 答案A.needn't 不必,不用.wouldn't 将不,mustn't 禁止、不能.shouldn't 不应该.本题为不需要,不必的意思,应用needn't.3）---Don't forget to come to my birthday party tomorrow.---______.A.I don't B.I won't C.I can't D.I haven't 答案B.will既可当作情态动词,表请求、建议、也可作为实义动词表“意愿、意志、决心”,本题表示决心,选B.12.比较need和dare

一、need表示“需要”或“必须”，作情态动词时，仅用于否定句或疑问句中，在肯定句中一般用must,have to,ought to，或should代替。多用在否定式或疑问句中.1.Need I attend the meeting tomorrow?

我需要明天参加会议吗? 2.You need not hand in the paper this week.这一周你不必交论文。

need 是一个情态动词，他的用法完全和其他情态动词一样，但 need 还可当作实义动词使用，这时 need 就象其他动词一样，有第三人称，单复数，后面加带 to 的动词等特性。1.I need a bike to go to school.我上学需要一辆自行车。2.Do you need a dictionary? 你需要词典吗? 3.She needs a necklace.她需要一条项链。

needn't + have + 过去分词 表示过去做了没必要做的事情。You needn't have taken it seriously.这件事情你不必太认真。

二、Dare表示“敢”，Dare作情态动词时，主要用于疑问句、否定句和条件从句中，一般不用在肯定句中。多用在否定或疑问句中。1.The little girl dare not speak in public.小女孩不敢在公众面前说话。2.Dare you catch the little cat? 你敢抓小猫吗? dare 除用作情态动词外，更多的是当实义动词使用，用法同实义动词一样，要考虑人称，单复数，时态等。

1.Do you dare to walk in the dark? 你敢黑夜走路吗？

2.He doesn't dare to tell the teacher what happened that day.他不敢告诉老师那天发生的事。

三、Dare和need常用作实义动词，有时态、人称和数的变化，所不同的是，作实义动词时，在肯定句中，dare后面通常接带to的不定式，在否定和疑问句中，dare后面可接带to或不带to的不定式。如：

I dare to swim across this river.He does not dare(to)answer.Don't you dare(to)touch it!I wondered he dare(to)say that.He needs to finish it this evening.另外need 的被动含义：need，want，require，worth（形容词）后面接doing，也 可以表示被动：need doing=need to be done Shall用于第一人称,表示征求对方的意愿.如：What shall we do this evening? 2.Shall用于第一、第三人称疑问句中,表示说话人征求对方的意见或向对方请示.如：Shall we begin our lesson? When shall he be able to leave the hospital? 3.Shall用于第二、第三人称,表示说话人给对方命令、警告、允诺或威胁.如：You shall fail if you don't work harder.（警告）He shall have the book when I finish reading.（允诺）He shall be punished.（威胁）