代词it的用法归纳.ppt

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1、代词代词it的用法归纳的用法归纳一 虚词 （第1-6项）二 形式主语（第7项共十一种句型）三 形式宾语（第8项）四 强调主语（第9项）This is not my book.It is Jims._1、指代前面提到过的事物。、指代前面提到过的事物。-Whats this?-Its a pencil.-Whats that?-Its a picture._2、代替指示代词、代替指示代词this或或thatSomeone is knocking at the door.Please go and see who it is.It is a lovely baby._3、指婴儿或不明身份的人、指婴儿

2、或不明身份的人-Whats the time now?-Its ten oclock._4、表示时间或季节、表示时间或季节-Whats the weather like today?-Its fine._5、表示天气、表示天气How far is it from your school to your home?_6、表示距离、表示距离_(1).It+be+adj.+of sb.to do sth.常用的常用的adj:kind/good/wrong/foolish.“某人做某事是某人做某事是.的的=Sb.+be+adj.+to do sth.Its silly of the boy to fe

3、ed the cat with a carrot.=The boy is silly to feed the cat with a carrot.那个男孩用胡萝卜喂猫真是太傻了。那个男孩用胡萝卜喂猫真是太傻了。It is generous of you to help those poor kids in the mountians.你帮助山里的穷孩子真是太慷慨了。你帮助山里的穷孩子真是太慷慨了。=You are generous to help the poor kids in the mountians.7、用作形式主语，常用于下列、用作形式主语，常用于下列11种种句型中句型中_(2).I

4、t+be+adj.+(for sb.)to do sth.常用的常用的adj:important/difficult/easy/commom.(对某人来说，对某人来说，)做某事是做某事是 =To do sth.+be+adj.(for sb.)Its impossible for Simon to swim across the river.对西蒙来说，游过那条河是不可能的。对西蒙来说，游过那条河是不可能的。=To swim across the river is impossible for Simon.It is possible to go hiking on the Great Wal

5、l in some other places.=To go hiking on the Great Wall in some other places is possible.Note:It is also great fun walking and cycling in Guilin.=Walking and cycling in Guilin is also great fun.动名词动名词doing和不定式和不定式to do的区别的区别动名词只表示常见性的动作；如果表示具体的动名词只表示常见性的动作；如果表示具体的或特定的或有待于实现的动作用不定式。或特定的或有待于实现的动作用不定式。P

6、ainting is an art.To paint the fence is difficult for Jimmy.=It is difficult for Jimmy to paint the fence.(3).It+be +no use/no good/no fun/(a waste of time)+doing sth.做某事是做某事是 看太多的电视没有好处。看太多的电视没有好处。It is no good watching too much TV.对必然要发生的事打赌是毫无意义的。对必然要发生的事打赌是毫无意义的。It is no fun betting on a sure th

7、ing.跟他交谈浪费时间。跟他交谈浪费时间。It is a waste of time talking/to talk with him.学而不思则罔。学而不思则罔。Its no use learning without thinking.(4).It+be +N.+to do sth.常用的名词：常用的名词：a pity/a pleasure/an idea.做某事是做某事是 错过如此重要的演讲太可惜。错过如此重要的演讲太可惜。It is a pity to miss such an important lecture.很高兴你能来。很高兴你能来。It was a pleasure to h

8、ave you here.(5).It+be +time to do sth./for sth/that(did sth).“到该做到该做 的时候了的时候了”恐怕我们得离开了。恐怕我们得离开了。I think its time for us to leave now.下课。下课。吃午饭！吃午饭！Class is over.Its time for lunch!It is time we left/for us to leave.我们该动身了。我们该动身了。(6).It+V.+to do sth.常用常用V：take/cost/need/sound.做做.花费花费/需要需要/听上去听上去.It

9、took a long time to build the wall.=To build the wall took a long time.用这种方式来做听起来有道理。用这种方式来做听起来有道理。It sounds reasonable to do it in this way.我们每天做作业通常要花我们每天做作业通常要花2-3小时。小时。It usually takes us 2-3 hours to finish the homework every day.(7).It seems that看起来像看起来像 It seems that he is quite happy._。(8).I

10、ts ones turn to do sth.轮到某人做某事轮到某人做某事 Its your turn to sing._。(9)It is/has been+N(时间）时间）since.It is/has been ten years since we first met._。（10）.Its+adj.+that从句从句 常见的常见的 adj:true/necessary/important/certain/possible/likely 你有必要出席会议。你有必要出席会议。Its necessary that you should be present at the meeting.我们城

11、市里的大多数居民将得到免费医疗，我们城市里的大多数居民将得到免费医疗，这一点是肯定的。这一点是肯定的。It is certain that free medical care will be given to most people in our city.（11）It+be+Past.P+that从句从句 常见的常见的 过去分词过去分词:reported/said/believed/well-known/decided.据报道据报道/说说/人们相信人们相信/众所周知众所周知/已决定已决定.据报道这种疾病破坏中枢神经系统。据报道这种疾病破坏中枢神经系统。It is reported that

12、this disease attacks the central nervous system.众所周知爱迪生发明了电灯。众所周知爱迪生发明了电灯。It is well-known that Edison invented the electric light.初三学生发觉英语考试拿初三学生发觉英语考试拿A+不很困难。不很困难。Junior Three students find it not too difficult to get A+in the English test.你认为有必要学习第二门外语吗？你认为有必要学习第二门外语吗？Do you think it necessary to

13、 learn a second foreign language?8、作形式宾语、作形式宾语 S.+V.+it+adj.+to do sth.常用常用V：think/feel/find/guess/imagine We saw him walking alone in the street on a cold rainy night.It was on a cold night that we saw him walking alone in the street.9、引导强调句型、引导强调句型It is/was+被强调部分被强调部分+that/who/whom+其他成分其他成分1.The b

14、aby is crying.Can you give _ some milk?A.he B.she C.it D.one B.2.Someone is knocking at the door.Whos _?C.A.he B.she C.it D.one CC3._ is about fifteen minutes walk from my home to my school.A.That B.This C.It C4。_ is necessary for students to take sports an hour per day.5._ is impolite of you to arg

15、ue with your mum.6.Some girls find _ difficult to learn math well.A.that B.this C.it CCCII.Paraphrase：1.It is wrong to say so.To say so is wrong.2.It was foolish of you to leave school.You were foolish to leave school.3 They will spend over a year building the bridge.It will take them over a year to

16、 build the bridge.4.He seems to enjoy pop songs very much.It seems that he enjoys pop songs very much.5.Talking with Jill is no use because he will never change his mind.It is no use talking with Jill because he will never change his mind.III.Translation 1.现在几点了？现在几点了？What time is it now?2.他离开那家公司真是

17、明智之举。他离开那家公司真是明智之举。Its wise of him to leave that company.3.和你谈话很开心。和你谈话很开心。It is a pleasure to talk with you.4.很显然，他读过这本书。很显然，他读过这本书。It is quite clear that he has read the book.5.我每天骑车去学校要花半小时。我每天骑车去学校要花半小时。It takes me half an hour to go to school by bicycle every day.6.下了整整三个小时的大雨。下了整整三个小时的大雨。It ra

18、ined heavily for three whole hours.7.他下周要出国是真的吗？他下周要出国是真的吗？Is it true that he will go abroad next week?8.介绍每一位流行歌星是我的工作。介绍每一位流行歌星是我的工作。It is my job to introduce each pop star.9.你昨天没你昨天没去去看成那部电影真遗憾。看成那部电影真遗憾。It is a pity that you didnt go to see the film yesterday.10.秋天树叶从树上落下是件常事。秋天树叶从树上落下是件常事。It is common that leaves fall from the trees in the fall.