it 是近年来高考的热点之一。它不仅可以指代时间、地点、天气、距离等，还可以作形式主语和形式宾语，同时还可以用于强调句结构中。下面结合高考试题来谈谈它的用法，希望能对同学们有所帮助。

　　一、it 用作代词的用法

　　1)用来指时间、地点、天气、距离等。例如:

　　It is seven o'clock now.

　　It is cold today.

　　It is twenty miles from here to our school.

　　2) 用来指代事物或前面提到过的事物或情况。例如:

　　It is a cat outside the door.

　　My mother bought a pen and it was made in Japan.

　　You've helped me a lot; I will never forget it.

　　3)用来指人。例如:

　　Who is it? It's me.

　　高考中榜题：

　　1.(NMET'93)Tom's mother kept telling him that he should work harder, but________didn't help.

　　A.he B.which C.she D.it(答案为D)

　　2.(NMET2001)The Parkers bought a new house but ________ will need a lot of work before they can move in.

　　A.theyB.it C.one D.which(答案为B)

　　二、it用作形式主语。 it 常用来代替不定式、动名词短语或名词性从句，位于句首，而被替代的真正主语后置。常见的句型有下面几种：

　　1) It's+名词/形容词+不定式。例如：

　　It is easy to do the job.

　　It's his duty to settle the problem.

　　2)It's +名词+动名词短语。例如：

　　It's no use asking him.

　　It's no good going there.

　　3)It's +过去分词 +名词性从句 。常用于该句型的过去分词有: said,told,reported,known,suggested,hoped,expected 等。例如：

　　It's said that he came from London.

　　It's reported that the president will come to visit our school.

　　It's not decided when we shall have our sports meet.

　　4)It's +名词/形容词+名词性从句

　　It's a pity that you can't go with them.

　　It's certain that he will attend the meeting.

　　It's no wonder why he was late.

　　高考中榜题：

　　3.(MET'89)Is ________ necessary to complete the design before National Day?

　　A. thisB.that C. it D.he(答案为C)

　　4.(NMET'95)________is a fact that English is being accepted as an international language.

　　A.There B.This C.That D.It (答案为D)

　　三、 it 用作形式宾语。不定式、动名词短语或名词性从句作宾语时，如果后面带有宾语补足语，常用it作形式宾语，而把真正的宾语放在宾语补足语后面。例如：

　　He found it very difficult to stop smoking.

　　The professor thinks it no good reading without understanding.

　　I have made it clear that nobody is allowed to smoke here.

　　高考中榜题：

　　5.(MET'90) I don't think________possible to master a foreign language without much memory work.

　　A. this B. that C. its D.it (答案为D)

　　6. (NMET'98) I hate ________ when people talk with their mouths full.

　　A.it B.that C. these D.them (答案为A)

　　四、 it 用于强调结构,常构成句型：It's +被强调部分+that/ who+句子的其他部分。 例如：

　　It was Tom who met with her in Nanjing.

　　It was at the gate that he told me the news.

　　It was because Li Ping was ill that he didn't come to school last week.

　　高考中榜题：

　　7.(NMET'97)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. when (答案为A)

　　8.(NMET'92) It was not ________she took off her glasses ________I realized she was a famous film star.

　　A.when; that B.until; that

　　C.until; when D.when; then(答案为B)

　　巩固练习：

　　1. I was disappointed with the film. I had expected ________to be much better. (NMET'93)

　　A.thatB.thisC.oneD.it

　　2. Was________ that I saw last night at the concert?

　　A.it you B.not you

　　C. you D. that yourself

　　3.________turn is ________to clean the classroom?

　　A. Which ; it B. Whose; it

　　C.Which; that D. Whose; that

　　4. ________that he enjoyed pop songs very much.

　　A. It seemed B. He seemed

　　C. It was seemingD. He was seeming

　　5. He ________ to do morning exercise in the park.

　　A.took a rule B.made a rule

　　C.made it a rule D. took it a rule

　　6. Does ________ matter if he can't finish the job on time? (MET'91)

　　A.thisB.thatC.heD.it

　　Key: 1-6 DABACD

　　(文/饶惠娟；英语通高中一年级版 03～04学年第4期； 版权归英语辅导报社所有，独家网络合作伙伴新浪教育，未经许可，不得以任何形式进行转载。)