it的用法归纳

1、?Never be afraid of grammar?Collect some examples;?Watch them very carefully;?Find out something in common;?Try to use the rules practise.it 用法完全归纳一、it 作人称代词的用法1. 指事物作为人称代词， it 可以除人以外的一切事物或动物。如：I dropped my watch and it broke. 我把手表掉在地上摔坏了。It 's hard work, but I enjoy it. 工作很辛苦，可是我乐意干。“Where is t

2、he dog?” “It's in the bedroom. ” “狗在哪 ?”在“卧室里 ”2. 指人it 指人主要用于指不性别不明的婴儿或用于确认某人的身份。如：Is it a boy or a girl? 是男孩还是女孩 ?There is a knock on the door. It must be the postman. 有人在敲门，一 定是邮递员。【说明】 在答语中，常用来指本人，如说 It's me。3. 代替某些代词 代词 it 还可用于代替指示代词 this, that 以及复合不定代词something, anything, nothing 等。如：“W

3、hat's this?” “It 's a new machine.” “这是什么 ?”是“一种新机Nothing is wrong, is it? 没出什么问题，是吗 ?二、it 作非人称代词的用法1. 基本用法it 作非人称代词的用法，主要用于指时间、距离、价值、天气、气候及温度等自然现象。如：It 's too late to go there now. 现在去那儿已经太迟了。It rained all day yesterday. 昨天下了一天的雨。It can get very hot here. 这里有时会很热。2. 用于某些句型It 's time

4、 for sth. 该做某事了。It 's time to do sth. 该做某事的时候了。It 's time for sb to do sth. 某人该干某事了。It' (about / high) time + that-从句.某人该做某事了。(从句 谓语用过去式，有时也用Should+动词原形”)It' first (second) time + that-从句.某人第几次干某事。(从 句谓语用现在完成时 )It' +时间段+ si nee-从句.自从有一段时间了。It' +时间段+ before-从句.过多长的时间才 三、it用作形式

5、主语1. 基本用法当不定式、动名词、从句等复杂成分用作句子主语时，为保持句子平衡，通常把真正的主语放在句末，而在句首使用形 式主语it。如：It 's very important to remember this. 记住这一点很重要。It's hard work climbing mountains. 爬山是费劲的事。It 's unknown when he will come. 他什么时候来还不知道。2. 用作形式主语的的重要句型(1) It + be + adj. for (of) sb to do sth 某人做某事It is hard for him to

6、make up his mind. 他很难下定决心。It was foolish of her to say such a thing. 她说那样的话，真是 太蠢了。【说明】(2) It takes sb +时间段+ to do sth.某人做某事花了 时间It takes years to master a new Ian guage.要花多年的时间才能 掌握一门新的语言。【说明】 此句型可以有以下多变种变体： It took me an hourto write the Ietter. =The Ietter took me an hour (to write). =I took an h

7、our to write the Ietter. 我写这封信花了一个小时。(3) It is up to sb to do sth. 该由某人做某事It 's up to you to to make the choice. 得由你来作选择。(4) it look (seem, appear, happen, occur) that as if 似乎It seemed as though he didn'trecognize me. 他似乎没认出我 来。It happened that I was out when he called. 他打电话时我碰巧不在家。为If it w

8、ere not for their help, we couldn 'thave got over the difficulties. 要不是他们帮助，这些困难我们不克服不了的。四、it用作形式宾语1. 基本用法当不定式、 动名词、 从句等复杂成分用作宾语且其后跟有宾 语补足语时， 通常会在宾语补足语前使用形式宾语， 而将真正的 宾语移至句末。其基本结构为 动词+it+宾语补足语+不定式(动名 词或从句 )”。如：I find it difficult to do the job well. 我发现做好这件事不容易。I think it best that you should sta

9、y here. 我认为你最好住这儿。We think it no use complaining. 我们认为抱怨是没有用的。2. 用作形式宾语的几个特殊结构(1) 动词 + it + that- 从句。如：I like it that you came. 你来了，我很高兴。I take it (that) he will come on time. 我认为他会准时来的。You can put it that it was arranged before. 你可以说这是以前安排的Rumor has it that the defence minister will soon resign. 据传

10、 闻，国防部长不久就要辞职。【说明】能用于此结构的动词不多， 常见的有 have, take, put, like 等。(2) 动词 + it + when (if)- 从句。如：We really appreciate it when she offered to help. 她来帮忙了， 我们十分感激。I 'd prefer it if I didn 't have to do so much work. 要是我不必 做那么多工作，好就太好了。【说明】 能用于此结构的动词不多，常见的有 enjoy, hate, love, like, dislike, appreciate

11、, prefer 等。(3) 动词 + prep + it + that- 从句。如：See to it that you're not late again. 注意千万不要再迟到。Look to it that this doesn 't happen again. 注意不要再发生这 种事。You may rely on it that he 'll come to meet you. 你放心，他会 来接你的。I,I can '【说明】 能用于此结构的动词不多， 常见的有 see to, look to, insist on, stick to, depend

12、 on, answer for 等。(4) 动词+ it + 介词短语+ that-从句。如：I owe it to you that I am still alive. 多亏有你我才仍然活着。I took it for granted that he would help us. 我认为他会帮助我 们的。【说明】 能用于此结构的动词不多，常见的有 take it for granted, bring it to sb 's attention, owe it to sb 等。It 的用法练习 一单项选择。1.Was it during the Second World War he

13、died?A.that B.while C.in which D.then2.Is necessary to take off our shoes when we enter the lab?A. everyone B.this C.her D.it3. Is possible to fly to the moon in a spaceship?A.now B.that C.it D.man4. I don' think _ possible to master a foreign language without much memory work.A.this B.that C.it

14、s D.it5.She heard of a terrible noise, _ brought her heart into her mouth.A.it B.which C.this D.that6. Alice received an invitation from her boss, came as asurprise.A.it B.that C.which D.he7. Does matter if he can' t finish the job on time?8. Tom' s mother kept telling him that he should wor

15、k harder, but didn ' t help.A.he B.which C.she D.it9. The weather turned out to be very good, _ was more than we could expect.A.what B.which C.that D.it10. is a fact that English is being accepted as an internationallanguage.A.There B.This C.That D.It11.I hope there are enough glasses for each g

16、uest to have A.it B.those C.them D.one12.It was about 600 years ago_the first clock with a face and an hour hand was made.A.that B.until C.before D.when13.I hate when people talk with their mouths full.A.it B.that C.these D.them14.It was only when I reread his poems recently I began toappreciate the

17、ir beauty.A.until B.that C.then D.so15.It is the ability to do the job matters not where you comefrom or what you are.16.It you that to blame.A.is;is B.is; are C.are;are D.are;is17. Wasthat I saw last night at the concert?A.it you B.not you C.you D.that you18. electricity plays such an important par

18、t in our life?A.Why is it that B.Why is itC.Why it is that D.Why is that19.It was he said disappointed me.A.what;whatB.that;thatC.what;thatD.that;what20.It was in the lab _ was taken charge of by Professor Harris_ they did the experiment.A.which; that B.that; what C.whom; thatD.which; where二 .分析 it

19、成分，辨清相似句型。21. is well know to us all that the earth is round. is well known to us all, the earth is round.A.ThatB.As C.ItD.Which22. d o e s n' t matter much whether he' ll come to theparty. I feelan honour to be in vited to speak here.23. _ no wonder that he has passed the exam. _ no need for you to wait here.A.There being B.It wasC.It is D.There is24. Was it the house Abraham Lincoln was born? Was it in the house Abraham Lincoln was born?A.thatB.whereC.whi