it的用法it用作实词（代词）和虚词（助词）。

一、代词：人称代词或者前文刚提到的人或事；作主语还可以表示时间、距离、天气、地点、温度等。

Who is it？It must be Mr. Smith.Where is my book? It is on the table.1. My bike is missing. I can't find__ anywhere.A. oneB. onesC. itD. that2. ____ four years since I joined the Army.A. There wasB. There isC. It wasD. It is3. Someone is ringing the doorbell. Go and see __. A. who is he B. who he isC. who is itD. who it is二、虚词（高考考点）：一）it用作形式主语替代从句、动词不定式、动名词，把真正作主语的从句、动词不定式、动名词置于句尾。

It替代作主语的不定式的常见句型1. It be adj. (for sb.) to do sth.2. It be adj. (of sb.) to do sth.1）Everyone knows that _______ is dangerous to play with fire, but _______ is difficult is to prevent children from playing with fire.A. it, itB. what, whatC. it, whatD. what, it2）I know_____ is important to know my own limitations, but _______ is difficult is to help others to know their own limitations.A. it, itB. what, whatC. it, whatD. what, itIt替代作主语的动名词的常见句型It’s no good/use doing…It’s (well) worth doing…It’s no use _over spilt milk.A. cryB. cryingC. that you cryD. for you to cryIt作形式主语替代主语从句①It is adj. +clause②It is v-ed that…=sb./sth. is to do③It is + noun +从句1）______ was known to them all that William had broken his promise _____ he would give each of them a gift.A. As; WhichB. What; thatC. It; thatD. It; which2）_______certain that his invention will make people’s life convenient. A. That’s B. This is C. It’s D. What’s3）_____ that their daughter got an opportunity to study abroad.A. It’s a exciting newsB. This is an exciting newsC. This is exiting newsD. It’s exciting news 二）it作形式宾语vt+it+宾补+真正的宾语（to do 不定式，v-ing，宾语从句）。

常用的动词有think, believe, make, find, consider, feel，suppose，regard，take，imagine等。

14.The doctor thought ____would be good for you to have a holiday. （10全国Ⅱ）A. thisB. thatC. oneD. it33.The fact that she was foreign made _difficult for her to get a job in that country（10辽宁）A so B. much C. that D. it三）用于强调句型中1. “It is/was+被强调部分+that/who+句子的其他部分”。

如果强调的是人,可以用who, whom 代替that。

2. It is not until + 被强调部分+ that ...用于强凋时间状语，“直到……才……”。

3. 强调句的一般疑问句句型：Is / Was +it +所强调的部分+that / who/ whom +其余部分?4. 强调句的特殊疑问句句型：特殊疑问词+is\was it + that / who +其余部分?三、高考习题1. I dislike ____when others laugh at me in public or think poorly of me behind.A. thatB. thoseC. itD. themenjoy, like, dislike, love, hate, prefer, appreciate 等表示喜恶的动词。

2. I hate __ if people say such things in public.A. thatB. thoseC. itD. them3. ”Excuse me, I want to have my watch fixed, but I can't fi nd a repair shop.“ ”I know ______ nearby. Come on, I'll show you.“A. oneB. itC. someD. thatit = the + 名词，one = a + 名词。

4. There is only one English-Chinese dictionary in that book-shop. I wonder if you still want to buy __. A. it B. one C. another D. any5. Will you see to see to （负责，注意）“ _______ that my children are taken good care of while I am away?A. itB. meC. yourselfD. them类似see to 用法的短语还有depend on,answer for（负责、保证）等。

6. You may depend on ___that he will turn up in time. A. it B. me C. which D. them7. I can't answer for ___ that the boy is honest.A. itB. meC. whichD. them8. — I don't know whether I should go abroad or not, Mum.—I leave__ to your own judgment whether you should do it. A. that B. It C. this D. what 9. They are good friends. _______ is no wonder that they know each other so well.A. ThisB. ThatC. ThereD. It10. Why don't you bring ______ to his attention that you are too busy to do it?A. thisB. WhatC. thatD. it11. In the west, people make __ a rule to send Christmas present to their relatives and friends.A. thisB. thatC. itD. these12. The color of my coat is different from ___ of yours. A. this B. that C. it D. one13. I can't quite remember__ you started doing the work .A. that it was whenB. when it was thatC. when was it thatD. that was it when14. It was only when I reread his poems recently ___I began to appreciate their beauty .A. untilB. thatC. thenD. so14. _____ he came back home that we knew what had happened .A. When it wasB. It was whenC. Was it whenD. When was it15. It was the training _____ he had as a young man _____ made him such a good engineer. A. what ; that B. that ; whatC. that ; whichD. which : that16. It was __he said __disappointed me at that time. A. what ; that B. that ; thatC. what ; whatD. that ; what17. It was when she was about to go to bed _____the telephone rang.A. sinceB. asC. thatD. then18. It was through Jack ____Mary got to know Bob . A. who B. whom C. how D. that19. It was ___ great care that they did the job.A. forB. aboutC. withD. in20. It was on October 1st 1949 ___ new China was founded . A. which B. when C. as D. that 21. It was the school gate ______ I met an old friend of mine after class .A. thatB. whichC. whereD. why22.___that caused him to serve dinner an hour later than usual. A. It was we being lateB. It was our being lateC. It was we were too lateD. It was because we were late23. “Where did you find the professor who made the speech yesterday？” “It was in the hall ______ the students often have a meeting.”A. whereB. whichC. thatD. when24. It was what he meant rather than what he said ___ annoyed me.A. whichB. asC. whatD. that25. It was in the small house ____ was built with stones by his father ____ he spent his childhood.A. which, that B. that, whichC. which, whichD. that, where26. Was it five o’clock __the fire broke out？A. whenB. thatC. whichD. in whichWas it at five o’clock ____the fire broke out？A. whenB. thatC. whichD. in which27. It’s more than half a century _____ my grandfather joined the Party and became a servant to the people.A. whenB. thatC. sinceD. while28.—Who are making so much noise in the garden？—______ the children.A. It isB. They areC. That isD. There are29. It is _____ he often fails in exams ______ makes his parents worried about him.A. what；thatB. that；whatC. that；thatD. / ；that30. It is the protection for the trees ____ really matters, rather than how many trees are planted.A. whatB. thatC. 不填D. which31. It is __ my father worked ___ I work now.A. where, thatB. where, whenC. that, whereD. that, that32. Was __that I saw last night at the concert？A. it youB. not youC. youD. that you33. It was ten o’clock ____ he came back home.A. whenB. thatC. sinceD. after34. It was not until he came back _____ he knew the police were looking for him.A. whichB. sinceC. thatD. before35. David said that it was because of his strong interest in literature ______he chose the course.A. thatB. whatC. whyD. how36. It was after he got what he had desired _________ he realized it was not so important.A. thatB. whenC. sinceD. as。