It的用法简介

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1、l1.用作人称代词，代替前文提到的用作人称代词，代替前文提到的事物。事物。l例如：例如：-Where is my book?l -Its on the table.l2.用以代替指示代词用以代替指示代词this,that.l例如：例如：l1)-Whats this?l -Its a flag.l2)-Whose exercise-book is that?l -Its hers.l3.指环境、情况。例如：指环境、情况。例如：lIt was very quiet at the moment.l4.指距离。例如：指距离。例如：lIt is five kilometers form the offi

2、ce to my home.l5.指时间、季节。例如：指时间、季节。例如：l-What time is it?l-It is eight oclock.lIt often rains in summer.l6.作形式主语：即当动词不定式、作形式主语：即当动词不定式、动名词、或从句做主语时，通常动名词、或从句做主语时，通常把它放在谓语后面。而用把它放在谓语后面。而用it 作句作句子的形式主语。例如：子的形式主语。例如：lIt is not a good habit to stay up late.lIt is no use crying over spilt milk.lIt is a pity

3、 that you didnt read the book.l7.做形式宾语：做形式宾语：l当复合宾语中的宾语是动词不定式、当复合宾语中的宾语是动词不定式、动名词、宾语从句时，往往把宾语动名词、宾语从句时，往往把宾语放在它的补足语后面，而用放在它的补足语后面，而用it 作形作形式宾语，放在宾语补足语之前。式宾语，放在宾语补足语之前。l例如：例如：lA.I think it no use arguing with him.lB.I found it very interesting to study English.lC.He made it clear that he was not inte

4、rested in this subject.l8.用于强调结构：用于强调结构：l要强调句的某一部分（通常是主语、要强调句的某一部分（通常是主语、状语宾语），可以用状语宾语），可以用it 构成句子结构：构成句子结构：lIt is/was 被强调部分被强调部分+that/who+句子句子的其他部分。的其他部分。l例如：例如：lIt is Prof.Lin who teaches us English.l(强调主语强调主语)lIt is English that Prof.Lin teaches us.l（强调宾语）强调宾语）lIt was in Shanghai that I saw the f

5、ilm.l（强调状语）强调状语）lIt was in 1975 that I worked in a factory .（强调状语强调状语）lWe had a meeting yesterday.lIt was we that had a meeting.lPracticePracticel1.Is_possible to fly to the moon in a spaceship?lA.now B.then C.that D.it.l2.Was it during the Second World War _he died.lA.that.B.while C.in which d.then

6、l3.Is _necessary to complete the design before National Day？lA,this B.that C,its d.itl4.I dont think _possible to master a foreign language without much memory work.lA.this B.that C.its D.it l5.Does _matter if he cant finish the job on time?lA.this B.that C.he D.it l6.It was not _she took off her da

7、rk glasses _I realized she was a famous film star.lA.when,that B.until,that lC,until,when D when,theml7.Toms mother kept telling him that he should work harder,but _didnt help.lA.he B.which C.she D,.itl8.It was not until 1920_regular radio broadcasts began.lA.while B.which C.that D.sincel9._is a fac

8、t that English is being accepted as an international language.lA.There B.This C.That D.Itl10.It was about 600 years ago _the first clock with a face and an hour hand was made.lA.that B.until C.before D.whenl11.I hate _when people talk with their mouths full.lA.it B.that C,these D theml12._no need for us to discuss the problem again since it has already settled .lA.It has B,There has C.It is D.There isl13.Was it in 1969_the American astronaut succeeded_landing on the moon?lA.when,on B.that,onlC.when,in D.that,in