it的语法讲解

第一篇：it的语法讲解

一、It 用作形式主语当不定式（短语）、动名词（短语）或从句在某个句子中作主语时，为保持句子结构前后平衡，避免头重脚轻，因此常用it作形式主语置于句首，而将真正的主语放在句尾。此时it只起先行引导作用...一、It 用作形式主语

当不定式（短语）、动名词（短语）或从句在某个句子中作主语时，为保持句子结构前后平衡，避免头重脚轻，因此常用it作形式主语置于句首，而将真正的主语放在句尾。此时it只起先行引导作用，本身无词义。

e.g.It is wrong to tell a lie.(说谎是错误的。)〔It为to tell a lie的形式主语〕 It is no use arguing about it.(争吵是没用的。)〔It为arguing about it的形式主语〕 It is uncertain who will come.(谁要来还不确定。)〔It为who will come的形式主语〕 It 作形式主语的常见句型：

① It + be + 形容词 + to do sth./ doing / that ….e.g.It is very important to learn a foreign language.(学一门外语非常重要。)It is useless crying over the spilt milk.(覆水难收。)It was really surprising that she married a man like that.(她嫁给那样的男士真让人惊讶。)② It + be +名词词组 + doing / that ….e.g.It is no good telling lies.(撒谎没好处。)It is a pity that you didn’t go to see the film yesterday.(你昨天没看成那部电影真遗憾。)It is a truth that there would be no new China without the Communist Party.(没有共产党就没有新中国，这是毋庸质疑的。)③ It + be + 过去分词 + that ….该句型常见动词有：say, hope, think, suppose, expect, report, know, believe, decide, etc.e.g.It is said that they have invented a new type of computer.(据说他们发明了一种新型电脑。)It is believed that China will become one of the strongest countries in the world.(大家都相信中国将会步入世界强国之列。)It was reported that more than 170 thousand people died in the 2004 tsunami.(据报道，至少有十七万人在2004年那场海啸中丧生。)④ It + seems / appears / happens等不及物动词 + that ….e.g.It seems that he enjoys pop songs very much.(似乎他非常喜欢流行歌曲。)It appears that Tom might change his mind.(看来汤姆可能会改变主意。)⑤ 若句子是疑问形式，就只能用it作形式主语。e.g.Does it matter much that they won’t come tomorrow?(他们明天不来很重要吗？)Is it true that he will go abroad next week?(他下周出国是真的吗？)⑥ It + takes +(sb.)+ some time + to do sth.这是一个表示“（某人）花多少时间干某事”的句型，其中it是形式主语，代替后面的不定式（to do sth.），句型中的sb.也可以省略。

e.g.It took me some time to read the reading materials.(我花了一些时间才读完那段阅读材料。)It took him fourteen hours to go to New Zealand from Shanghai by plane.(从上海乘飞机去新西兰花了他14小时。)How long does it take you to go to Beijing from Qingdao by train?(从青岛坐火车到北京一般要花多久时间？)I am not sure, but I think it takes at least nine hours to get there.(我不能肯定，但估计至少要九个钟头才能到那儿。)

二、It 用作形式宾语

当不定式（短语）、动名词（短语）或从句在某个句子中作宾语时，为保持句子结构平衡，避免句式结构的混乱，常用it作形式宾语，而将真正的宾语放在句尾。此时it仍只起先行引导作用，本身无词义。

下列四种情况须用it 作形式宾语：

① 当不定式（短语）、动名词（短语）或从句在复合宾语结构中作某些动词的宾语时（如think, make, find, consider, feel, suppose等）；

e.g.They found it pleasant that they worked with us Chinese.（他们发现与我们中国人一起工作很愉快。）

I don’t feel it difficult to understand the Special English.（我觉得理解英语特别节目并不难。）He makes it a rule never to borrow money.（他立志决不向别人借钱。）

I think it no need talking about it with them.（我认为没必要跟他们谈。）

② 某些表示“喜、怒、哀、乐”的动词，如like, enjoy, love, hate等，往往不能直接接宾语从句；

e.g.I don’t like it that he’s so lazy.（我不喜欢他那么懒惰。）

I hate it when my mother asks me to eat eggs.（我讨厌母亲要我吃鸡蛋。）

③ that引导的宾语从句不能直接作介词的宾语； e.g.You may depend on it that we shall always help you.（尽管放心，我们会随时帮你的。）

Would you see to it that she gets home early?（你负责保证她早到家，好吗？）He insisted on it that he was innocent.（他坚持说自己是无辜的。）

④ 由及物动词与介词组成的固定搭配中，宾语从句若作该动词的宾语时，须借用it。

e.g.I leave it to your own judgement whether you should do it.（我让你自己判断这事是否该做。）

We owe it to you that there wasn’t a serious accident.（多亏了你才没有发生严重事故。）试比较下列高考题，选出最佳答案：

1.Is _______ necessary to complete the design before National Day?(MET89)A.this B.that C.it D.he 2.I don’t think _______ possible to master a foreign language without much memory work..(MET90)A.this B.that C.its D.it 3.Does _______ matter if he can’t finish the job on time?(MET91)A.this B.that C.he D.it 4.Tom’s mother kept telling him that he should work harder, but _______ didn’t help.(MET93)

A.he B.which C.she D.it 5._______ is a fact that English is being accepted as an international language.(MET95)A.There B.This C.That D.It 6.I hate _______ when people talk with their mouths full.(MET98)A.it B.that C.these D.them 7.Don98)A.take as granted B.take this for granted C.take that for granted D.take it for granted 8.I like _______ in the autumn when the weather is clear and bright.(MET2004)A.this B.that C.it D.one 模拟练习：

1._______ happened _______ he is unfit for the office.A.This;that B.That;that C.It;that D.He;that 2.We took _______ for granted that they would accept our advice.A.that B.this C.it D.them 3._______ that the scientist will give us a talk next month? A.Is true B.Is it true C.It’s true D.It’s truly

4._______ doesn’t matter much _______ dress you are going to wear.A.This;that B.That;who C.It;which D.It;who 5._______ is going to America for further study.A.He is said that B.People said that he C.It was said he D.It is said that he 6.They are good friends._______ is no wonder that they know each other so well.A.This B.That C.There D.It 7.Is _______ possible to fly to the moon in a spaceship? A.this B.there C.that D.it 8.She liked _______ when he kissed her.A.him B.that C.one D.it 9._______ will do you good to do some exercise every morning.A.It B.There C.Those D.One 10.We think _______ our duty to pay taxes to our government.A.that B.this C.its D.it Key: 高考真题: 1-8 CDDDDADC 模拟练习: 1-5 CCBCD 6-10 DDDAD

第二篇：高中语法填空讲解

语法填空十三条解题技巧

一、已给单词提示题型的技巧

此类题可以考查学生对单词形式变化的掌握程度。单词形式变化主要有两种，一是词的形、数、式的变化，一是词的派生变化。在判断出词的变化之后还应该进一步审题，看是否需要使用复合的变化形式，这一点是很重要的。

技巧一：名词形式变化。名词的形式变化主要有单数、复数、所有格的变化。

例1：There are many students living at school, the＿＿(child)houses are all far from school.由students一词可以判断出横线处应填复数，且作为houses的定语，所以应用其所有格形式，故答案为child的复合变化形式——复数的所有格ehildren's。

技巧二：动词形式变化。动词的形式变化比较多，有谓语的变化（时态、语态、语气），有非谓语的变化（不定式、动名词、现在分词、过去分词）。

例2：Atalk＿＿(give)tomorrow is written by Professor Zhang.句中的is是整句的谓语，所以横线所在的动词应当用作非谓语。从tomorrow可以看出，报告是“将来”作的，故用不定式；且报告是give动作的承受者，故可以判断出横线所在处用give的不定式被动式——to be given。

技巧三：代词形式变化。代词形式变化通常是与人称变化有关的三大类五小类，即人称代词（主格和宾格）、物主代词（形容词性和名词性）、反身代词。另外还有几个不定代词的形式变化，如no one/none、other/another等。

例3：The king decided to see the painter by＿＿(he).由介词by可以看出，横线处应填反身代词himself。

技巧四：形容词、副词比较级变化。英语中大部分形容词和表方式的副词都有原级、比较级和最高级的变化。构成比较级和最高级的方式，或通过加后缀-er和-est，或在词前加more/less和most/least，且形容词的绝对最高级还要冠以the。

例4：I am＿＿(tall)than Liu Wen.He is the tallest students in my class.此题后句交代了Liu Wen是班上最高的学生，那“我”肯定比他矮，所以不能用taller，只能用表示程度不如的“less tall”。

技巧五：数词形式变化。数词的形式变化包括基数词、序数词，或加后缀-teen、-ty的变化，甚至还有作分母用的序数词的单复数形式，以及one/two的特殊变化形式once/twice。

例5：To my three sons I leave my seventeen horses.My eldest son shall take a half, my second son shall take a＿＿(three)...从上下文连续起来理解，这是一个分马的计划，大儿子分得a half，也就是“一半”或“二分之一”，那么二儿子应该得“三分之一”，所以要填人作分母的序数词“third”才能命中目标。

技巧六：词的派生。词的派生现象在英语单词中是很常见的，派生现象主要发生在名词、动词、形容词、副词四种词中。这种题型还有可能检测学生对词根、前后缀、派生词的 掌握。

例6：Lious lost his wallet yesterday, so he was very＿＿(happiness).在这道题中，学生很容易判断出该用形容词，由此可知将happiness还原成词根happy；钱包丢了，人应该是不开心的，所以要再加个前缀un-，就成了unhappy。

二、未给单词提示题型的技巧

此类题难度较大，但也是有方法对付的。

技巧七：固定短语结构。根据句中横线前后及整句来判断横线前后是否构成一个固定短语，但有时要对横线前或后的几个单词“视而不见”才能命中答案。

例7：The children were playing on the ground, enjoying＿＿,dirty but happy.从句中的happy可以猜出孩子们是开心的，所以应用enjoy oneself短语，故其答案为themselves。

例8：His boss was＿＿angry as to fire him.如果“跳过”横线后面的angry，就可以发现这里用到一个关联短语so...as to，所以，so是正解。

技巧八：从句引导词。从句是此题型最为常见的一个方向，主要检测学生对引导词的掌握程度。

例9：He did not do＿＿his father had asked him to do.审题可知，横线所在为宾语从句的引导词，此引导词在从句中充当宾语，且指物，所以是 what。

例10: Those＿＿want to go to the village must sign here.经过观察可以判断横线所在为定语从句的引导词，进一步观察可知先行词为those，且指人，所以只能填入who。

技巧九：短语动词结构。短语动词是以动词为中心的两个或多个词构成的短语，此类短语中往往是动词与介词或副词连用的多些。

例11：The US consists＿＿fifty states.根据常识可知，美国由50个州组成，故横线处与前一词组合，表示“由„„组成”，所以答案是of。

例12：Mrs Baker was ill, so her daughter had to ask for leave to take＿＿of her.生病需要人照顾，所以答案是care，与前后词构成take care of。

技巧十：短语介词结构。短语介词即多个词的组合起介词作用的短语，如：except for, due to等。

例13：Mr Smith took a plane to London＿＿of taking a train.此题中说到两种交通工具，所以可以理解此句有“坐„„而不是坐„„”的意思，故答案为instead，以构成介词短语instead of。

例14：Just then, he saw a blackboard in＿＿of him.细心观察，可以看出填入front即可构成in front of，此题得解。

技巧十一：连词、关联短语结构。常用的连词有and, or, but, so, for, while等，常用的关联短语有both...and, either...or, neither...nor, not only...but also等。

例15：Little Wang Jun could not go to school, ＿＿his family was too poor.此处表示原因，引导的分句其实是一种解释说明，不是必然的因果关系，且前面有逗号隔开，所以填for。

例16：＿＿Marrie and Jannie like going to the theatre.横线处的词与后面可以构成both...and，故答案为Both。

技巧十二：冠词、介词和常用的副词。冠词只能是在a，an，the之间判断；常用的介词有in，at，on，before，during等，通常考查固定搭配；副词的量还是比较多，如：however，never，yet，much等，但一般不会考查-ly形式的方式副词（见技巧六——形容词派生副词的情况）。

例17：Jackie likes to drive at＿＿high speed.这里考查的是不定冠词的习惯用法，答案为a，构成at a high speed，“以高速”开车。

例18：Old Tom's grand-danghter used to visit him＿＿Saturday afternoon.Saturday afternoon是指定的某天下午，所以不用介词in，而用on才是正解。

例19：Though Liu Qiang did the same work＿＿Zhang Wen did，he got a lower pay＿＿Zhang

第一条横线可由前面的the sanle判断出用as，第二条横线则可由lower判断出比较意义，故答案为than。

例20：It was only one day left,＿＿,his father had no idea to answer him.观察技巧十三：上下文中出现的相关词。这一招是最为灵活的，但也是最难的。学生可以根据上下文；关系和自己积累的知识，填入某个已出现的词，或其反义词，或其同类的某个词。

答案的线索可能在本句，可能出现在上下相连的一句，还可能出现在比较远的，地方——上下段中与此段位置大体相当的句子。如果该横线出现在某段的首句，则线索可能在上下段的首句；如果横线出现在某段的末句，则线索可能在上下段的末句，以此类推。上下句，可以看出是转折关系，且横线与前后用逗号隔开，排除but，所以答案是however。

例21：Tony＿＿travelling abroad, but dislikes staying home watching TV.由第二句话中的dislikes可以判断，此横线处应该是填其反义词likes。

语法填空作为一种新颖的题型，能全面地考查学生的英语综合应用能力。上述十三条技巧概括了此题型的多数考查方向，在高考备考复习中能起到很好的加强作用，真正做到事半功倍，较大地提高学生在此题型上的得分率。

第三篇：英语选修课语法简要讲解

语法专题

（一）定语从句

考点一：关系代词的用法 1．关系代词的作用和分类(1)关系代词的作用有三个：

①连接作用：关系代词引导从句，把它和主句连接起来； ②替代作用：关系代词在从句中替代它前面的先行词；

③成分作用：关系代词在从句中充当主语、宾语、表语、定语成分。(2)关系代词的用法分类

关系代词的用法分类有三点依据：

①根据所引导的从句的限制性和非限制性； ②根据所替代的先行词是指人还是指物；

③根据它在从句中所充当的成分——主语、宾语、表语或定语。2．易混关系代词辨析(1)关系代词that和which 先行词是物时，关系代词that，which一般可以通用，但也有区别。

1)只能用that的情况

①先行词为指物的不定代词(all, nothing, the one, much等)或被不定代词修饰时，如： You can take any seat that is free.Tell us all that you know.②先行词是序数词或被序数词修饰时，如：

That is the first composition that I've written in English.③先行词是形容词最高级或被形容词最高级修饰时，如： This is the best way that has been used against pollution.④当人和物同为先行词时，如：

Everyone wants to see the spaceship and the spaceman that made the flight around the earth.⑤关系代词在从句中作表语时，如： He is no longer the man(that)he used to be.⑥先行词被the only，the very修饰时，如： That is the very pen(that)I am looking for.⑦当先行词是which时，如：

Which of the two cows that you keep produces more milk? ⑧先行词为the way/the time/the moment/the first time/the last time等名词时，如： I don't like the way(that)he talks.This is the third time(that)he has been late this week.注意：此时that为关系副词，若先行词没有被the first/the last修饰时，用that和when均可，如：

The time(that)/(when)I saw you was 8：00.(2)关系代词as和which as既可指人又可指物，主要用于as…；as…as；the same…as…；such…as…等结构中，在从句中作主语、宾语或表语。引导的从句可位于句中、句首、句末。如：

As is reported in the newspaper，talks between the two countries are making progress.Mary was late for school，as is often the case.as引导非限制性定语从句，修饰整个句子，而which不仅可修饰整个句子还可以修饰单个名词。如：

The meeting，which was held in the park，was a success.The meeting was a success，as was expected.(3)who和that 先行词是人时，关系代词可用who(m)，that引导定语从句，但下列情况一般用who，而不用that。

①先行词是one，ones，anyone或anybody，those时，如： Anyone who breaks the law should be punished.②一个句子中带有两个定语从句，其中一个的关系词是that时，如：

The student that won the first prize is the monitor who speaks English best in our class.③在there be句型中和非限制性句型中，如： There is a person who wants to see you.I met an old classmate yesterday, who is now a manager of a big company.(4)who，whom和whose who指人，在定语从句中作主语或宾语，whom指人，在定语从句中作宾语。作宾语时who和whom一般可通用，但直接放在介词之后时，一般只用whom，不可用who。如：

Take your problem to the person who you think can help you.She is the girl(who/whom)I will go to Shanghai with.＝She is the girl with whom I will go to Shanghai.whose既可指人，也可指物，在从句中作定语。如：

George Orwell，whose real name was Eric Arthur，wrote many political novels.The librarian refused to accept the book，whose cover was gone when it was returned.3．关系词的省略

①作宾语的关系代词可以省略，但前面不能有介词。如： This is the man(who/whom/that)we have talked about.②口语中，关系副词可以省略(尤其是先行词为time，way，reason等时)。如： This is the reason(why)I did it.I don't know the time(that)he arrived.4．限制性和非限制性定语从句

①限制性定语从句起修饰限制的作用，是主句不可缺少的一部分，与先行词无逗号隔开，翻泽成中文常译成前置定语。如：

Those who want to go，sign their names on the paper.那些想去的人把他们的名字签在纸上。5．定语从句中的主谓一致

①关系词在定语从句中作主语时，从句的谓语动词要与先行词保持一致。如： I，who am your friend，will leave for Beijing tomorrow.which和as指代一个句子时，从句谓语动词用单数。如：

Mary is often late for class，which makes our teacher very unhappy.6．“介词/介词短语＋which/whom”中介词的选择

关系代词前面的介词使用是根据与名词前面的动词搭配关系和介词的搭配关系及句子结构上的需要而定的。如：

We'll never forget the day on which we went camping.(on the day)The woman to whom we spoke is from the USA.(speak to sb.)His glasses，without which he was(＝who was not)like a blind man, fell to the ground and broke.(由句意决定)考点二：关系副词的用法

1．当先行词在定语从句中作状语时，要用关系副词。其中when＝表示时间的介词(如：in，at，during等)＋which；where＝表示地点的介词(如：in，at，on，under等)＋which；why＝for＋which。如：

I still remember the day when I first came to Beijing.(when＝on which)Can you tell me the office where he works?(where＝in which)Do you know the reason why he is absent?(why＝for which)2．高考对关系副词where的考查

高考试题中对于where的考查趋于复杂，从先行词由“明显的地点”转为“地点的模糊化”。事实上，对于where这个词，考生不能只理解为表示地点。当先行词表示某人/物的处境，或某事所发展的阶段，或表达某事的某个方面时都可用where这个关系副词。如： The accident had reached to a point where both their parents are to be called in.事情发展到如此程度，不得不请双方家长来一趟了。试比较下面的句子：

①Do you still remember the days that/which we spent in Qingdao? 3 你还记得我们一起在青岛度过的日子吗？

②Do you still remember the days when we spent the summer holidays in Qingdao? 你还记得我们在青岛过暑假的日子吗？

在句①中，定语从句中缺宾语，因此须用关系代词that/which来引导从句，而在句②中，定语从句中不缺主语，也不缺宾语，因此须用关系副词when来引导从句。2．定语从句与其他句式的比较

It is such a heavy box that he can't lift it.(状语从句)It is such a heavy box as he can't lift.(定语从句)Is this factory the one in which/where we lived three years ago？(定语从句)Is this factory where we lived three years ago？(表语从句)As is known to the world, Mark Twain is a great American writer.(定语从句)It is known to the world that Mark Twain is a great American writer.(主语从句)That Mark Twain is a great American writer is known to the world.(主语从句)We don't understand the problem why this is the best choice.(同位语从句)The reason that he gave was not right.(定语从句)She did all she could to help him.(定语从句)She is not the girl she used to be.(定语从句)She did what she could to help him.(宾语从句)She is not what she used to be.(表语从句)由以上例句可以看出，分清定语从句与其他复合句的关键是要掌握先行词及其后的关系词，要看其是否在从句中作成分，是否有意义。3．注意way和time后接定语从句的情况

(1)当先行词是way意为“方式、方法”时，在定语从句作状语，引导定语从句的关系词有下列三种形式。如：

(2)先行词是time时，若time作“次数”讲时，应用关系代词that引导定语从句，that可省略；若time作“一段时间”讲时，应用关系副词when或介词at/during＋which引导定语从句。如： This is the second time(that)the President has visited the country.这是总统第二次访问那个国家。

I could hardly remember how many times(that)I've failed.我几乎记不清我已失败多少次了。

This was at a time when/during which there were no radios，no telephones or no TV sets.这是一段没有收音机，没有电话，没有电视机的时间。

语法专题

（二）时态和语态

一、动词时态的用法 1．一般现在时

(1)由连词if，unless，however等引导的时间(条件、让步)状语从句，需用一般现在时表将来。

However much advice you give him，he will do exactly what he wants.(2)安排或计划要做的动作(有时间状语)限于begin，come，leave，go，arrive等一类动词。

I arrive in Beijing at 3∶00 p．m.tomorrow.2．一般过去时

过去一段时间内经常或反复发生的行为，常与every day，often，sometimes等时间状语连用。

I used to play football when I was young.3．一般将来时

(1)will＋do表示将来的动作或状态，常与一些表示将来的时间状语连用；或表示事物的固有属性或必然趋势。

Fish will die without water.注意：临时决定做某事，只能用此时态。—The lights in the classroom are still on.—Sorry，I’ll go and turn them off.(2)be going to＋do表示即将发生的或最近打算进行的事。此外还表示根据现在的迹象，对未来进行推测。

Look at the clouds.It is going to rain.(3)be about to＋do表示即将发生的动作，意为“正要；很快，马上”。后面一般不跟具体的时间状语，但是可以由when连接一个并列句。

We are about to leave.(4)be to＋do表示事先商定、安排或准备要做的事情；还表示可能性、必要、责任、义务、禁止等。

She is to get married next month.(5)用现在进行时表示将来。表示位置转移的动词(go，come，leave，start，arrive等)，可用现在进行时表示将来。

Uncle Wang is coming.4．现在进行时

表示说话人对主语的行为表示赞叹或厌恶等感情色彩，常与always，constantly，continually等副词连用。

She is always asking the same question.5．现在完成时

现在完成时表示从过去某一时刻开始一直延续到现在的动作或状态，或者还要延续下去，句中常有since，for，yet，already等表示一段时间的状语。

Great changes have taken place in China since 1980.6．过去进行时

过去进行时表示在过去某个时刻正在进行的动作或存在的过去某个阶段正在做的事情。He was reading an interesting book this time yesterday.7．过去完成时

(1)表示在过去某个时刻前已经发生的动作或存在的状态，或者从过去某个时刻开始一直延续到过去另一时刻的动作或状态。

My teacher had taught in that school for ten years before she came here.(2)表示希望或打算的动词(如hope，want，expect，think，suppose，plan，mean，intend等)的过去完成时，后接不定式to do时，表示未曾实现的愿望或打算，即“本来希望或打算做某事(但却没做)”。

I had planned to send him a Christmas card，but I forgot to do so.(3)用于下列特殊句型中：

①hardly/scarcely/barely had...done...when...；no sooner had...done...than...。从句中用一般过去时，表示“刚刚„„就„„”。

Hardly had I opened the door when he told me.②It/That/This was the first/second...time＋that从句。that从句要用过去完成时态。It was the second time he had been out with her.8．过去将来时

过去将来时表示从过去的观点来预计以后要发生的动作或存在的状态，这种时态常用于宾语从句中，主句常是一般过去时。

He always said that he would study hard at that time.二、被动语态的用法

1．不知道动作的执行者是谁或难以说明时常用被动语态。Street lights are often turned on at six in winter.2．当动作的承受者比起动作的执行者来说更能引起人们的关注而需要加以强调时，要用被动语态。

This kind of bicycle is not sold in our shop.3．含有双宾语的句子，主动句中的间接宾语或者直接宾语都可变为被动语态中的主语，另一个保留不变。变为主语的若是主动句中的直接宾语，间接宾语前则需加介词to或for。

The pianist gave the pupils(间接宾语)some advice(直接宾语)． →The pupils were given some advice by the pianist.→Some advice was given to the pupils by the pianist.4．在主动语态句中，动词make，have，let，see，watch，hear，feel等后接动词不定式作宾语补足语时，动词不定式不加to。但变成被动语态时后面的不定式都需加上to。

The boss made them work ten hours a day.→They were made to work ten hours a day by the boss.三、注意事项

1．现在进行时用法注意点(1)状态性动词不用进行时态。

(2)进行时态和副词always，forever等连用时，往往带有一定的感情色彩，如赞扬、批评、不满、抱怨等。

2．过去进行时与一般过去时的区别

过去进行时表示动作的未完成性、持续性，着眼于动作的过程；一般过去时表示动作的完成，即动作发生过，且已结束，着眼于结果。

She was writing a report last night and I don’t know if she has finished it.(表示昨晚一直在写)She wrote a report last night.(表示昨晚写了，并且写好了)3．语态

(1)动词sell，write，read等与well，smoothly，easily等连用时，说明主语内在的“性能”、“特点”，用主动表示被动。

(2)表示状态特征的连系动词如smell，taste，feel，sound，look，prove等无被动语态，用主动形式表示被动意义。

(3)不及物动词及一些固定短语不能用被动语态：come up，run out，give out等。

(4)以被动的形式表主动意义：有些动词devote，surprise，seat，hide，station，dress等，由于能接反身代词，因此，可用被动形式表主动意义。

语法专题

（三）情态动词

一、can和could的用法 1．表示能力

Her mother can speak French.2．表示客观可能性

Anybody can make mistakes.3．表示许可(多用于口语)Can I go now? 4．表示惊异、怀疑、不相信的态度(主要用于否定句、疑问句或感叹句中)How can you be so careless!5．can的特殊用法

can but只有；can’t but不得不；can’t...too再怎样也不为过，越„„越好。I can but wait.I can’t but wait.You can’t be too patient to the customers.二、may和might的用法 1．表示允许、请求 —May I watch TV now? —Yes，you may.(Yes，please.)—No，you mustn’t.(No，you’d better not.)2．表示可能性(主要用于陈述句、肯定或否定句，疑问句用can代替)The story may not be true.3．表示祝愿(不用might)May you succeed!4．may/might as well最好还是„„ You might as well do it now.5．may/might well很可能 He may well be late for class.三、must，have to和ought to的用法 1．must(1)must表示“必须，应该，一定要”。强调主观看法，只有现在时形式，否定式是must not(mustn’t)。must开头的问句，其否定回答要用needn’t或don’t have to代替。

(2)must表示必然的结果。All men must die.(3)must还可表示主语固执、偏要做他人不希望做的事。It can’t help；he must do that.2．have to着重客观需要，能用于更多时态(过去时或将来时)。He will have to be there before ten.3．ought to表示义务和责任，“应该”，比should语气要强。You ought to take care of yourself.四、need和dare的用法

1．need表示“需要，必要”，只能用于否定句和疑问句。在肯定句中，常用must和have to代替。

2．dare表示“敢”，通常用于否定句、疑问句和条件状语从句中。Dare you go home alone at eleven in the evening? 3．need和dare的特殊用法

(1)need表“需要”时，可用want，require代替。The desk needs to be repaired./The desk needs repairing.(2)dare作实义动词时，在肯定句中要接to，在疑问句和否定句中to可省去。He dares to catch a snake.五、will和would的用法 1．will(1)表示请求、建议，常用于第二人称。Will you please go with me?(2)表示意愿、决定、允许。I will never do that again.(3)表示习惯性动作或某种倾向，“总是，惯于”，通常用于第三人称。Fish will die out of water.2．would(1)表示请求、建议，比will委婉，指现在时间，多用于第二人称。Would you like a cup of tea?(2)表示过去习惯性动作或某种倾向。We would play badminton on Sundays.六、shall和should的用法 1．shall(1)用于第一、三人称，在问句中表示征求对方意见或请求。(2)用于第二、三人称表示命令或威胁。You shall do as your father says.2．should(1)表示责任、义务，意为“应该”。(2)表示惊讶语气，意为“竟然”。You should wear slippers in class.(3)用于条件句，表示“假如，万一”，省去if，should可提至句首。Should you be late，apologize to the teacher.七、“情态动词＋have done”的用法

1．must have done sth.；can(could)have done sth.(1)must have done sth.表示对过去已经发生的事情的有把握的推测，意思是“想必、准是、一定做了某事”，只用在肯定句中。

It must have rained last night，for the ground is wet.(2)can(could)have done sth.表示对过去发生的动作的怀疑和不肯定，通常用在否定句和疑问句中。

He can’t have forgotten it.2．needn’t have done sth.；didn’t need to do sth.(1)needn’t have done sth.表示已完成不需要完成的动作。

You needn’t have waken me up.I don’t have to go to work today.(2)didn’t need to do sth.表示没有必要做而实际上也没有做某事。I didn’t need to clean the windows.My brother did it.3．may/might have done sth.may/might have done sth.表示对过去已发生的动作的推测，意为“也许/或许已经„„”。I’m not sure.He might have said so at the conference.4．should have done sth.should have done sth.表示本来应该做某事而实际上未做。You should have told him about it.5．had better have done sth.；would rather have done sth.；would like/love to have done sth.(1)had better have done sth.表示事后的建议，含轻微责备的口吻，意为“当时做了某事就好了”，其否定形式had better not have done sth.表达相反的含义。

(2)would rather have done sth.表示“宁愿当时做某事”，其否定形式would rather not have done sth.表达相反的含义，两者都含有“后悔”之意。

I would rather have taken his advice.(3)would like/love to have done sth.表示过去愿意做某事，但未做成。

I would love to have gone to the party last night，but I had to work extra hours to finish my report.语法专题

（四）名词性从句

在句子中起名词作用的句子叫名词性从句。名词性从句的功能相当于名词词组，它在复合句中能担任主语、宾语、表语、同位语等，因此根据它在句中不同的语法功能，名词性从句又可分别称为主语从句、宾语从句、表语从句和同位语从句。

考点一 whether 与if whether与if 在作“是否”的意思讲时在下列情况下一般只能用whether，不能用if： 1．引导主语从句并在句首时。

Whether the meeting will be held tomorrow has not been decided yet.2．引导表语从句和同位语从句时。

We should discuss carefully the question whether we can finish it on time.3．引导从句作介词宾语时。

It all depends on whether they will lend us the money.4．从句后有“or not”时。

I didn't know whether or not he had arrived in Beijing.5．后接动词不定式时。

I don't know whether to go to the party.考点二 that，what与which 1．that 引导名词性从句时，在从句中不充当任何句子成分，只起连接作用，也没有任何含义；that 引导的宾语从句一般不作介词的宾语(介词but，except，besides，in除外)。

That he failed the exam made me surprised.(主语从句，that不充当从句成分)He is a good student except that he is a little careless.2．what引导名词性从句时，其意义为“„„的人/物/数目等”，在从句中充当主语、宾语、表语或定语。作主语、宾语和表语时what可以分解成“定语从句的先行词＋关系代词”，即常说的“先行词＋that”。

Our income is now double what it was ten years ago.(what 指“„„的数目”)You will know what side effect the medicine brings about.(作定语，意思为“什么样的”)He lives in what we call“spring city”．(表示“„„的地方”)＝He lives in the place that we call “spring city”．

You don't know what good students they are.(表示“多么”，此为感叹句用于宾语从句中)3．which 引导名词性从句，其意义为“哪一个”，可指人也可指物，是在已知的具体的人、事、物当中进行选择；引导定语从句时，只能当关系代词，在从句中作主语或宾语，且只能指物。

Tell me which book you like better，the red one or the blue one？I will buy the book which you choose for you.4．A is to B what C is to D“A对于B 就像C对于D 一样”。Air is to us what water is to fish.空气对于我们就像水对于鱼一样。考点三 whoever，who与no matter who 1．whoever有两个作用，一是相当于anyone who，引导名词性从句，可以理解为who引导的定语从句修饰anyone，因此表达的主体为“任何人”；二是相当于no matter who，引导让步状语从句。

Whoever comes late should say sorry to our teacher.(是“人”应该道歉)2．who引导名词性从句时，有疑问语气，突出表达“谁„„”这一件事。引导定语从句时代替先行词在从句中作主语或宾语。

Who came late yesterday was unknown.(是“谁迟到”这件事不知道，而不是不认识这个人)3．no matter who只引导让步状语从句。No matter who you are，you're welcome here.考点四 “疑问词＋ ever”和“no matter＋疑问词”

1．“疑问词＋ever”可引导名词性从句，在从句中要充当一定的成分。还可引导让步状语从句。Whoever breaks the rule must be punished.However late he comes back，his wife will wait for him.2．“no matter＋疑问词”只能引导让步状语从句。No matter who breaks the rule，he must be punished.考点五

that引导宾语从句时的省略

宾语从句中的连接词that通常可以省略，但在以下几种情况中that不能省略： 1．当从句前有插入语时，that不可省略。

We hope，on the contrary，that he will stay at home with us.2．当一个句子有两个或多个并列宾语从句时，引导第二个和以后的宾语从句中的that不能省略。

He said he was wrong and that he would say sorry to me.3．当that作介词宾语时，that不可省略。

The reason lies in that she works harder than the others.4．由it作形式宾语时，that引导的宾语从句中，that不可省略。I think it impossible that he can finish the task in such a short time.考点六 it作形式主语的常见句型

1．It is＋名词(no wonder，an honor，a good thing，a pity，no surprise等)＋从句。It is no surprise that we will win the match.2．It is＋形容词(obvious，true，natural，surprising，good，funny，possible，likely，certain等)＋从句。

It is certain that he will come.3．It＋be＋过去分词(said，reported，thought，expected，decided，announced 等)＋从句。

It is said that Mr Smith has arrived.考点七 doubt 后面的从句

doubt用于肯定句时，其后的宾语从句用whether/if引导，同位语从句用whether引导；用于否定句时，宾语从句和同位语从句都用that引导。

There is no doubt that we will have an exam next week.I doubt whether/if Tom will recover.

第四篇：状语从句语法讲解

高中英语状语从句

一、定义：

在句中作状语的从句是状语从句,修饰主句中的动词、形容词或副词等.状语从句由从属连词引导,从属连词在句中不充当句子成分,只起连接作用,状语从句放在句首时,要用逗号,放在句尾时不用.二、分类

根据意义上的不同,状语从句可分为：①时间状语从句 ②地点状语从句 ③原因状语从句④目的状语从句 ⑤条件状语从句 ⑥结果状语从句⑦让步状语从句 ⑧方式状语从句 ⑨比较状语从句

三、时间状语从句主句是一般将来时,时间状语从句用一般现在时表将来；主句是过去将来时,从句用一般过去时表示过去将来时；主句是一般过去时,从句用一般过去时.记忆：“主将从现”

（一）引导时间状语从句的连词有：As, when(whenever), before, after, as soon as, until(till), since, every time, once.（二）、具体应用1）“while” 主、从句动作或状态同时发生.用while引导的从句用延续性动词,常表示较长的时间或一个过程.记忆：While 后用进行时.While we were having supper, all the lights went out.Please keep quiet while others are studying.While I was writing letters last night, he was watching TV.2）When表示“就在„„的时候”, while意为反而,可是,表示转折.One evening Beethoven was walking in a street, when he suddenly stopped outside a little house.3）Whenever 无论什么时候,随时

1.Whenever someone throws in some rubbish, the truck produces a piece of music.每当有人扔进一些垃圾时,它（汽车）就放一段音乐.2.Whenever we’re in trouble, they will help us.3.I go to the theatre, whenever I am free.4.Come and see me whenever you want to.你随时来看我.4）till和until(表示“直到„„”)句首多用until

1、在肯定句中表示“直到„„为止”,主句谓语动词要用延续性动词.I was waiting until/till he arrived.2、在否定句中表示“直到„„才”主句谓语动词常用终止性动词,这时until和till常被before替换.I didn' t leave till/until she came back.5）since: 主句用完成时,从句用一般过去时,since引导的从句间或可用现在完成时.It is two years since I have studied English.1.We have known each other since we were children.2.We have been friends(ever since)since we met at school.3.It is „„(一段时间)+since+一般过去时态句子.It is two years since my sister married.„„(一段时间)have/has passed since +一般过去时态句子 Two sisters have/has passed since my sister married.Since+时间点

1.I have been at home since three o' clock this afternoon.2.Maria has been in China since two years ago.6）Every time, each time, next time Every time you get back at night, you drop your boots on the floor.Every time I catch cold, I have pain in my back.Next time I go there, I will visit them.7）once 一旦„就

Once you begin, you must go on.你一开了头,就应该继续下去.四、地点状语从句

地点状语从句用where, wherever引导

We should go where the people need us.我们应该去人民需要我们的地方.Where there is a will, there is a way.有志者,事竟成.Wherever they went, they received a worm welcome.无论他们走到哪儿都受到热烈欢迎.She follow him whose he goes.他无论到哪里她总跟着.五、原因状语从句

原因状语从句用because(因为),since(既然), as(由于)引导

1、字母由多到少,语气由强到弱.2、由why提问必须用because回答.Since, as不回答why的提问,而且从句一般放在句首,because一般放在主句之后.3、before of +名词

Because of the rain, we didn' t go to the park.4、because 和so不可连用,只能选其一.（另有although, but）Why didn' t he come to school? Because he was ill.Since I must die, I must.既然我一定要死,我一定这样做.Since a lot of people make mistakes in life, Mr Smith wanted to give John a Chance.5、for并列连词,不能放在句首,主要放在两个并列句之间.For所提供的理由为一个补充说明,而且前面常有逗号隔开.The days we short, for it is December now.六、目的状语从句 目的状语从句用so(常用于口语), that, so that, in order that引导

目的状语从句的谓语常含有may, might, can, could, should, would等情态动词.1.We'll sit never to the front so we can hear well.2.He studied hard so that he might succeed.3.I'll speak slowly so that you can take notes.4.They hurried to the station in order that they could catch the train.5.I took a taxi so that I could get there earlier.6.I’m going to the lecture early so that I may get a good seat.七、条件状语从句

条件状语从句由if, unless,(so)as long as(只需)引导

在条件状语从句中要用一般时表示将来时（与时间状语从句相同）

We will miss the train if you don' t hurry.He said we would miss the train if we didn't hurry.You will fail the exam unless you study hard.=(if you don’t study hard)He won’t come unless he is invited.=(if he isn't invited)Eat less food unless you want to become fatter.=(if you don’t want to become better)As long as you are not afraid of difficulties, you are sure to succeed.As long as you don't lose heart, you will succeed.八、结果状语从句

结果状语从句由such„that, so„.that, so that, that 引导 1.Such„ that 的常用句型

such +a/an +形容词+可数名词单数+that such +形容词+可数名词单数+that Such+形容词+可数名词复数（不可数名词）+that

注意so many(much, few, little)+名词,such a lot of(或lots of)+名词是惯用法,不可乱用.She is such a beautiful girl that we all like her.They were such beautiful flower that we bought home.It was such delicious food that they ate it up.2.so+形容词或副词+that so+形容词+a/an+可数名词单数+that He is so rich that he can buy lot of things for himself.He works so hard that he did everything well.It was so hot a day that we all went swimming.It was such a good day that we all went swimming.3.so that, that都可以引导结果状语从句

He didn't study hard,(so)that he failed the exam.4.Too„to, enough„to 可以引导结果状语从句与so„that 替换,so„that结构可以用too„to替换必须具备两个条件,一是主句和结果状语从句的主语必须一致,二是从句中的谓语部分必须含有can(could)not.She is young that she can’t go to school.She is too young to go to school.She isn't old enough to go to school.九、让步状语从句 although, though even though = even if, whether„or however = no matter how whatever = no matter what whoever = no matter who whenever = no matter when wherever = no matter where

*although和though都表示“虽然”只是although 更正式,多用于句首,而though用于句中,二者都可与yet, still连用,但不与but连用

Although/Though they are poor, they often help others.They are poor, but they often help others.Although he has failed many times, he doesn' t give up trying.Whatever/No matter what you say, I won' t believe you.No matter what you say, I don' t care.No matter who you are, you must obey the rules of our school.However hard he tried, he failed again.No matter what the weather is like, you can always find surfers out riding the waves.十、方式状语从句

方式状语从句由as(如同,按照),as if(though)引导

*as和like都有“像”的意思,as是连词,后面连接句子,like是介词后面可加名词、代词或名词性短语.I did the work as others did.相当于 I did like others.You must do as I do.as if(though)两者意义相同,从句谓语动词常用虚拟语气,但实现可能性较大,则用连接词.It seems as if/though it’s going to rain.They are talking as if/though they were old friends.She treats me as if I were her brother.When you are in home,do as the Romans do.例 You must do ______ I told you.A.after B.before C.where D.as(D)The students must do ______ the teacher told them.A.as B.before C.after D.if(A)

十一、比较状语从句

比较状语从句由as„as, not as(so)„as, than, the+比较级,the+比较级引导 He swims as well as you.(do)He doesn' t swim as well as you(do).He got here earlier than you.(did)The busier he is, the happier he feels.英语语法状语从句类型综述状语从句主要用来修饰主句或主句的谓语.一般可分为九大类,分别表示时间、地点、原因、目的、结果、条件、让步、比较和方式.尽管种类较多,但由于状语从句与汉语结构和用法相似,所以理解和掌握它并不难.状语从句的关键是要掌握引导不同状语从句的常用连接词和特殊的连接词即考点.现分别列举如下: 1．时间状语从句

常用引导词：when, as, while, as soon as, while, before, after, since , till, until

特殊引导词：the minute, the moment, the second, every time, the day,the instant, immediately , directly, no sooner „ than, hardly „when, scarcely „ when

I didn’t realize how special my mother was until I became an adult.While John was watching TV, his wife was cooking.The children ran away from the orchard(果园)the moment they saw the guard.No sooner had I arrived home than it began to rain.Every time I listen to your advice, I get into trouble.2．地点状语从句

常用引导词：where 特殊引导词：wherever, anywhere, everywhere

Generally, air will be heavily polluted where there are factories.Wherever you go, you should work hard.3．原因状语从句

常用引导词：because, since, as, since

特殊引导词：seeing that, now that, in that, considering that, given that, considering that, inasmuch as, insomuch as

My friends dislike me because I’m handsome and successful.Now that everybody has come, let’s begin our conference.The higher income tax is harmful in that it may discourage people from trying to earn more.Considering that he is no more than 12 years old, his height of 1.80 m is quite remarkable.4．目的状语从句

常用引导词：so that, in order that

特殊引导词：lest, in case, for fear that,in the hope that, for the purpose that, to the end that

The boss asked the secretary to hurry up with the letters so that he could sign them.The teacher raised his voice on purpose that the students in the back could hear more clearly.5．结果状语从句

常用引导词：so „ that, so„ that, such „ that，特殊引导词：such that, to the degree that, to the extent that, to such a degree that，He got up so early that he caught the first bus.It’s such a good chance that we must not miss it.To such an degree was he excited that he couldn’t sleep last night.6．条件状语从句

常用引导词：if, unless，特殊引导词：as/so long as, only if, providing/provided that, suppose that, in case that, on condition that

We’ll start our project if the president agrees.You will certainly succeed so long as you keep on trying.Provided that there is no opposition, we shall hold the meeting here.7．让步状语从句

常用引导词：though, although, even if, even though

特殊引导词： as(用在让步状语从句中必须要倒装),while(一般用在句首),no matter „, in spite of the fact that, while, whatever, whoever, wherever, whenever, however, whichever Much as I respect him, I can’t agree to his proposal.尽管我很尊敬他,我却不同意他的建议.The old man always enjoys swimming even though the weather is rough.No matter how hard he tried, she could not change her mind.He won’t listen whatever you may say.8．比较状语从句 常用引导词：as(同级比较), than(不同程度的比较)

特殊引导词：the more „ the more „;just as „, so„;A is to B what /as X is to Y;no „ more than;not A so much as B

She is as bad-tempered as her mother.The house is three times as big as ours.The more you exercise, the healthier you will be.Food is to men what oil is to machine.食物之于人,犹如油之于机器.9．方式状语从句

常用引导词：as, as if, how

特殊引导词：the way

When in Rome, do as the Roman do.She behaved as if she were the boss.Sometimes we teach our children the way our parents have taught us.英语语法状语从句

第五篇：小学语法知识讲解

园丁教育 英语、数学培训 因为专业，所以精彩！

小学4、5、6年级语法知识讲解

一.否定句的改法：

1.先找Be动词（am、is、are）和情态动词（can、should、may、shall、would）

2.找到了则在Be动词或者情态动词后面直接加not；其他部分不变照抄。

3.没有找到，则要请助动词（don’t、doesn’t）来帮忙，把助动词放在主语（一般是人或物）的后面，动词前面。后面的动词要变原形，其他部分不变照抄。

4.如果句子中有some要变成any。

二、一般疑问句的改法：

1.先找Be动词（am、is、are）和情态动词（can、should、may、shall、would）

2.找到了则把Be动词或者情态动词放在句首大写，其他部分不变照抄，句首要大写变小写。

3.没有找到，则要请助动词do、does来帮忙，把助动词大写放在句首，句子中的动词变成原形，其他部分不变，照抄。

4.如果句子中中有some要变成any，有I和we要变成you，my和our要变成your。

5.最后一定要牢记，把句号改成问号。

三、对划线部分提问的一般步骤：

1.根据划线部分，确定特殊疑问词，放在句首大写：

A、基本特殊疑问词：

what-对事物进行提问、where-对地点进行提问、when-对时间进行提问、which-对那一个进行提问，或者选择性提问、who-对人进行提问、whose-对谁的进行提问或者说对名词所有格或形容词性物主代词进行提问、why-对原因进行提问、how-对方式方法进行提问

B、合成特殊疑问词：

常见的基本疑问词+形容词或副词构成特殊疑问词的形式：

a.How+形容词或副词：

how many-对数量进行提问、how much-对钱进行提问、how old-对年龄进行提问、how long-对长度进行提问 how tall 对高度提问、how often 对频率进行提问，多次时间一次 b.what+形容词或者副词

what time 对具体的时间进行提问、what subject（s）-对课程进行提问、what lessons-对课进行提问、what colour-对颜色进行提问、c.which + 名词

which boy-对哪一个男孩进行提问、which man-对那一个男人进行提问……

2.把原句改成一般疑问句：

3.划掉划线部分，把剩下的部分放在特殊疑问词后面，句号变问号，大写变小写。

4.注意：如果划线部分是主语，则要用到合成疑问词补足主语。

四、那些地方会出现动词原形：

1.助动词后面+动原2.情态动词后面+动原3.let’s 后面+动原

4.动词不定式to 后面+动原5.祈使句中用动原6.不是三单的一般现在时用动原

五、人称代词宾格用法；

1.动词后人称代词用宾格2.介词后人称代词用宾格

六、部分介词：

in 在…里面on 在…上面under 在…下面behind 在…后面 beside 在…旁边next to 紧靠… near在…附近in front of、in the front of 在…前面

园丁教育 英语、数学培训 因为专业，所以精彩！4、5、6年级专项练习

一、陈述句变一般疑问句

1.His father is an English teacher.___________________________________________ ?

2.These cats are crying.（喊叫）___________________________________________ ?

3.They can swim.___________________________________________ ?

4.I like to read（阅读）English.___________________________________________ ?

5.I go to school on foot.（走路）___________________________________________ ?

6.He is crying（哭）under the tree.___________________________________________ ?

7.He goes to school every day.___________________________________________ ?

8.Everybody is in the classroom.___________________________________________ ?

9.Joy has a small T-shirt.____________________________________________ ?

10.These are my grandparents.____________________________________________ ?

11.My parents can play tennis.____________________________________________ ?

二、改否定句

1.His father is an English teacher._______________________________.2.These cats are crying.（喊叫）___________________________________.3.They can swim.____________________________________________.4.I like to read（阅读）English._____________________________________.5.I go to school on foot.（走路）________________________________________.6.He likes English.___________________________________________.7.His father goes to work by bus.（乘公共汽车）____________________________.8.He is crying（哭）under the tree.__________________________________.10.We are from China.____________________________________.11.He often goes to the library（图书馆）on Sundays._______________________.12.They have a class meeting every week.________________________________.13.She does her homework.__________________________________.14.He often watches TV.___________________________________.三、对划线部分提问：

1根据汉语提示，将句子所缺部分写完整，每空一词。

1._______ _______is your teacher?I don’t know.(多高)

2._______ _______ is the picture on the wall? It’s red.（什么颜色）

3._______ _______ do you get up every day?At 6:30.（几点）

4._______ _______ books do you have?Fifteen.（多少）

5._______ _______are you in?I’m in Class 3, Grade 8.（几班）

6._______ _______dose she take a shower?Twice a week.（多久一次）

7._______ _______will you stay here?For seven days.（多长时间）

8._______ _______is the T-shirt? It’s 50 yuan.（多少钱）