it的用法归纳(11页).doc

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1、- it的用法归纳-第 10 页 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。Its hard work, but I enjoy it. 工作很辛苦，可是我乐意干。“

2、Where is the dog?” “Its 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 Its 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 t

3、his?” “Its a new 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：Its 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Its time for sth. 该做某事了。Its time to

4、 do sth. 该做某事的时候了。Its time for sb to do sth. 某人该干某事了。Its (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”)Its first (second) time + that-从句. 某人第几次干某事。(从句谓语用现在完成时)Its + 时间段 + since-从句. 自从有一段时间了。Its + 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

5、句末，而在句首使用形式主语it。如：Its very important to remember this. 记住这一点很重要。Its hard work climbing mountains. 爬山是费劲的事。Its 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 make up his mind. 他很难下定决心。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 me an hour to write the letter. =The letter took me an hour (to write). =I took an hour to w

7、rite the letter. 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Its 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 didnt recognize 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。(5) If it were not for / I

8、f it hadnt been for 若不是因为If it were not for their help, we couldnt have 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

9、that you 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。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 wi

10、ll soon resign. 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 when you whistle. 我不爱听你吹口哨。(from )We really appreciate it when she offered to help. 她来帮忙了，我们十分感激。Id prefer it if I didnt 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

11、的有 enjoy, hate, 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 to meet you. 你放心，他会来接你的。I cant answer for it that he will come. 我不能保证他会来。(fro

12、m )【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 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 s

13、b 等。It 的用法练习一单项选择。1.Was it during the Second World War _he died?2.Is _ necessary to take off our shoes when we enter the lab? A. everyone B.this C.her D.it 3. Is _ possible to fly to the moon in a spaceship? A.now B.that C.it D.man 4. I dont think _ possible to master a foreign language without much

14、 memory work.5.She heard of a terrible noise, _ brought her heart into her mouth. A.it B.which C.this D.that 6.Alice received an invitation from her boss, _ came as a surprise.7.Does _ matter if he cant finish the job on time?8.Toms mother kept telling him that he should work harder, but _ didnt hel

15、p.9.The weather turned out to be very good, _ was more than we could expect.10._is a fact that English is being accepted as an international language.11.I hope there are enough glasses for each guest to have _.12.It was about 600 years ago_the first clock with a face and an hour hand was made.13.I h

16、ate _ when people talk with their mouths full.14.It was only when I reread his poems recently_ I began to appreciate their beauty.15.It is the ability to do the job _ matters not where you come from or what you are.16.It _ you that _ to blame. A.is;is B.is; are C.are;are D.are;is17.Was_that I saw la

17、st night at the concert? A.it you B.not you C.you D.that you 18._ electricity plays such an important part in our life? A.Why is it that B.Why is it C.Why it is that D.Why is that 19.It was _ he said _ disappointed me. A.what;what B.that;that C.what;that D.that;what 20.It was in the lab _ was taken

18、charge of by Professor Harris _ they did the experiment. A.which; that B.that; what C.whom; that D.which; 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. _doesnt matter much whether hell come to the party. I feel _ an honour

19、to be invited to speak here. A.this B.it C.that D.what 23. _ no wonder that he has passed the exam. _ no need for you to wait here. A.There being B.It was C.It is D.There is24. Was it the house _ Abraham Lincoln was born? Was it in the house _ Abraham Lincoln was born? A.that B.where C.which D.both

20、A and B 25. Its very kind _ you to help us. Its very important _ you to keep the balance of nature. A.for B.of C.to Dwith .26. It is no good _ such a thing. Its of no importance _ such a thing.27.Its time that we _ to school. It is the second time that we _ to Beijing. A.go B.went C.have been D.have gone28.Its tomorrow _ he is going to Beijing. It was 8 oclock _ he went to school.29.It is 3 years _ he joined the army. It will be 3 years _ we meet again.KEYS：1-5ADCDB 6-10CDDBD 11-15DAABB 16-20BAACA