it的用法归纳

1、Never be afraid of grammarCollect 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. 坏了。我把手表掉在地上摔It s h ard work, but I enjoy it.工作很辛苦，可是我乐意干。“Where is the dog ”

2、“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：“Whats this ” “It s a new

3、 machine. ” “这是什 么”“是一种新机器”。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 t o 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 for sth.该做某事了。It s time to do sth.该做某事的时候了

4、。某人该干某事了It s time for sb to do sth.It s (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 s 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 s +时间段+ since-从句.自从有一段时间了。It s +时间段+ before-从句.过多长的时间才?三、it 用作形式主语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

5、句首使用形式主 语 it 。如：It s very important to r emember 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 某人做某事他很难下定决It is hard for him to make up his mind.It was foolish of her to say such a thing.

6、她说那样的话，真是太蠢了。【说明】介词of与for的区别是：of用于指某人的性格、属性、特征等，介词for表示对象，意为“对来说” (from(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 language.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 mean hourto write the letter.=The letter took mean hour (to write).我写这封信花了一个=I took an hour to write th

7、e letter.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 asif似乎It seemed as though he didn t recognize me. 他似乎 没认出我来。他打电话It happened that I was out when he called.时我碰巧不在家。(5) If it were not for /If ithadn t been for 若

8、不是因为If it were not for their help, we couldn t have gotover 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

9、 should stay 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。我认为他会准你可以说I take it (that) he will come on time.时来的You can put it that it was arranged before.这是以前安排的。Rumorhas it that the defence minister will soon resi

10、gn. 据传闻，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：I dislike it whenyou whistle. 我不爱听你吹口哨。 (from 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, hat

11、e, love, like, dislike, appreciate, prefer等。(3) 动词 + prep + it + that- 从句。如：See to it that youre not late again.注意千万不要再迟到。Look to it that this doesnt happen again. 注意不要再发生这种事。You may rely on it that hell come t o meet you. 你 放心，他会来接你的。I can t answer for it that he will come.我不能保证他会来。 (from 【说明】 能用于此

12、结构的动词不多，常见的有 see to, look to, insist on, stick to, depend 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 sbs attention, owe it to sb等。It 的用

13、法练习 一单项选择。it during the Second World War he diedwhich necessary to take off our shoes when we enter the labA. everyone3. Is possible to fly to the moon in a spaceship4. I don t think _ possible to master a foreign language without much memory work.heard of a terrible noise, _ brought her heart into

14、her mouth.6.Alice received an invitation from her boss, cameas a surprise. matter if he can t finish the job on times mother kept telling him that he should work harder, but didn t help.weather turned out to be very good, _ was more than we could expect.a fact that English is being accepted as an in

15、ternational language.hope there are enough glasses for each guest to havewas about 600 years ago_the first clock with a face and an hour hand was made.hate when people talk with their mouths full.was only when I reread his poems recently I beganto appreciate their beauty.is the ability to do the job

16、 matters not where youcome from or what you are. you that to blame.;is ; are ;are ;isI saw last night at the concert you you you electricity plays such an important part in our life is it that is itit is thatis thatwas he said disappointed me.;what ;that;that;whatwas in the lab _ was taken charge of

17、 by ProfessorHarris _ they did the experiment.; that; what; that; where二. 分析 it 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.22. doesn t matter much whether he ll come to theparty. I feel an honour to be invited to speak here.23. _ no wond

18、er that he has passed the exam. _ no need for you to wait here.being wasis is24. Was it the house Abraham Lincoln was born Was it in the house Abraham Lincoln was bornA and B25. It s very kind you to help us.you to keep the It s very important balance of nature.Dwith .26. It is no good such a thing. It s of no importance suc