高中英语课件-it的用法.ppt

1、优秀课件，精彩无限！1Good morning,everyone!优秀课件，精彩无限！2 It is never too old to learn.It is easier to fall than to rise.It is no use crying over spilt(溢出的溢出的)milk.It never rains but it pours(泼水泼水).Proverbs(谚语谚语)with“It”活到老活到老,学到老。学到老。摔倒容易爬起来难。摔倒容易爬起来难。覆水难收。覆水难收。不鸣则已不鸣则已,一鸣惊人。一鸣惊人。优秀课件，精彩无限！3 It is easy to open

2、a shop but hard to keep it always open.It takes three generations(代代,辈辈)to make a gentleman.创业容易守业难。创业容易守业难。十年树木，百年树人。十年树木，百年树人。优秀课件，精彩无限！4Grammar:Use of “It”优秀课件，精彩无限！52023-5-5 课文原句再现课文原句再现1.Its a beautiful day here and I am sitting under the big tree at the end of the garden.2.Your mother tells me

3、 that you started smoking some time ago and now you are finding it difficult to give it up.3.Believe me,I know how easy it is to begin smoking and how tough it is to stop.优秀课件，精彩无限！6优秀课件，精彩无限！7Read and analyze the following sentences.It is Friday today.It was very cold last Monday.It is about 8:30 n

4、ow.It is about 25km from Longxian to Bazi.It lies in the south of Shaoguan city.It is 40C!You got a high fever!Conclusion:it 可以用作可以用作非人称代词非人称代词，表示，表示_,_,_,_,_,_等。等。DateweathertimedistanceplaceTemperature 日期日期天气天气时间时间距离距离地点地点温度温度优秀课件，精彩无限！8e.g:_ a.Jim is at the door_wants to see you b.Someone is at t

5、he door_must be Jim A.That,It B.It,He C.He,It D.Who,He一般说来，在指代身份或性别明确的人时，通一般说来，在指代身份或性别明确的人时，通常要根据情况用代词常要根据情况用代词heshe；若是指代身份；若是指代身份或性别不明的人，则用代词或性别不明的人，则用代词itBackC优秀课件，精彩无限！91.I cant find my pen.Im going to buy _.2.Life today is better than _ in the old days.3.I cant find my pen.I must have lost _._用

6、来指代前面提到的可数名词，所指的是事物本身；用来指代前面提到的可数名词，所指的是事物本身；_则用来替代前面出现过的可数名词，泛指，指一类则用来替代前面出现过的可数名词，泛指，指一类事物中的一个事物中的一个 ._用来代替不可数名词或单数可数名词，特指。用来代替不可数名词或单数可数名词，特指。onethatit itonethat优秀课件，精彩无限！101 It 作为形式主语作为形式主语 当不定式、动名词、从句等用作句子主当不定式、动名词、从句等用作句子主语时，为保持句子平衡，通常把真正的主语语时，为保持句子平衡，通常把真正的主语放在句末，而在句首使用形式主语放在句末，而在句首使用形式主语it.优

7、秀课件，精彩无限！112023-5-5eg:1.It is illegal（for a teenager）to drive a car without a license.2.It is necessary for you to give him a letter.Conclusion：在句在句1和句和句2中中 it 的作用是的作用是_,真正主语是真正主语是_。形式主语形式主语不定式短语不定式短语（1）It+be+adj.+（for sb.）to do sth.此处此处adj.通常为描述通常为描述事件事件的形容词：的形容词：easy，difficult，hard，necessary，impos

8、sible，likely，right，wrong，important，obvious，useful，useless，dangerous优秀课件，精彩无限！122023-5-5（2）It+be+adj+of sb.to do sth此处此处adj.通常为描述通常为描述人人的形容词：的形容词：kind，unkind，nice，rude，cruel，considerate，careless，foolish，stupid，wise，crazy.eg:1.Its kind of you to help me with the problem.某人做某事某人是某人做某事某人是.2 Its foolish

9、of you to quit your job now.优秀课件，精彩无限！132023-5-53.It is no good crying over spilt milk.4.It is no use casting pearls before swine.在句在句3与句与句4中，中，it的作用是的作用是_,真正主语真正主语是是_.形式主语形式主语动名词短语动名词短语构成如下结构：构成如下结构：It is+no use/no good/not any good/not any use+doing sth.优秀课件，精彩无限！14Read and analyze the following s

10、entences.It is obvious that the water was to blame.Is it possible that he will become the chairman of our country?It is amazing that at my age I still look like a student!Analysis：it是是_ ,句子真正的主语句子真正的主语是是_形式主语形式主语thatthat引导的主语引导的主语从句从句Conclusion：It is+_+that从句从句adj.优秀课件，精彩无限！15跟踪训练跟踪训练1：It is+adj.+th

11、at从句从句 很明显他已经知道了那个坏消息。姚明篮球比易建联打得好是肯定的。It is obvious that he has known the bad news.It is certain that Yaoming plays basketball better than Yijianlian.优秀课件，精彩无限！16It is said that 据说据说 It is reported that It is supposed that It is hoped that It is well known that 据报导据报导据推测据推测希望希望众所周知众所周知普遍认为普遍认为有人建议有人

12、建议It is said(reported.)that.It is suggested thatIt is generally considered that该句型中的该句型中的it it 仍是形式主语，真正主语是仍是形式主语，真正主语是thatthat引导的主语从句。引导的主语从句。优秀课件，精彩无限！17 1.1.吸烟危害健康，这是事实。吸烟危害健康，这是事实。2.2.碰巧我们在同一间大学碰巧我们在同一间大学 。3.3.据说日本发生了地震。据说日本发生了地震。4.4.有人建议他应该立刻戒烟。有人建议他应该立刻戒烟。It is a fact that smoking does harm to

13、 health.It happens that we are in the same college._ there is an earthquake in Japan.It is said that_ he should quit smoking at once.It is suggested that优秀课件，精彩无限！18二、二、it作形式宾语作形式宾语优秀课件，精彩无限！191.I found it very interesting to study English.我发现学英语非常有趣。我发现学英语非常有趣。2.I think it no use arguing with him.我

14、认为和他争吵没有用。我认为和他争吵没有用。3.He made it clear that he was not interested in this subject.他非常清楚地表示他对那门学科不感兴趣。他非常清楚地表示他对那门学科不感兴趣。小结：it在句中充当_，真正宾语可以由_ 以及_短语充当。还可以由_引导的宾语从句充当。不定式不定式动名词动名词that形式宾语形式宾语优秀课件，精彩无限！20 总结：总结：当复合宾语中的宾语是不定式、动名当复合宾语中的宾语是不定式、动名词宾语从句时词宾语从句时,往往把真正的宾语放在它的往往把真正的宾语放在它的补足语后面，而用补足语后面，而用it 作形式宾

15、语作形式宾语,放在宾语放在宾语补足语之前。补足语之前。该句型中的该句型中的it 作形式宾语作形式宾语,常用的动词有常用的动词有think,believe,make,find,consider,feel等。等。优秀课件，精彩无限！21在一些固定用法中考查在一些固定用法中考查常见的固定用法有常见的固定用法有:make itforget itbelieve it or not Dont mention it It doesnt matter It(That)depends Got itIts hard to sayIts up to you to do sth.take it/things easy

16、成功，成功，做到，赶上等做到，赶上等别提了，忘了它吧别提了，忘了它吧信不信由你信不信由你别提了，表示不用谢别提了，表示不用谢没关系没关系视情况而定视情况而定明白了，懂了明白了，懂了很难说很难说 由你来决定做某事由你来决定做某事不要慌，别担心，沉住气不要慌，别担心，沉住气优秀课件，精彩无限！22Rewrite the sentences using an“it”structure.1 Giving up smoking is difficult.(It is)2 Most people believe smoking causes cancer.(It is believe that)3 Don

17、t try to quit on a stressful day.(Its no use)4 you could suffer from bad health if you keep smoking.(It is likely that)It is difficult to give up smoking.It is believed that smoking causes cancer.It is no use trying to quit on s a stressful day.It is likely that you could suffer from bad health if y

18、ou keep smoking.优秀课件，精彩无限！23 One midnight,was raining heavily.Mary was lying in bed.She couldnt fall sleep.Suddenly,she heard someone knocking at the door.“Who is?”She asked.She looked at the clock hung on the wall.was striking two.“is me.”One man answered.“was impossible for him to appear here.”she

19、 thought.“John?Is_ you?”“Yeah!is me”the man answered.She rushed to open the door.John was just standing in front of her.He said to Mary excitedly,“I missed the plane.was said that the plane I would take crashed down three hours ago.It was in that plane I should have gone to New York.After this,I thi

20、nk clearly that I love you so much I want to be marry you.”ititItItItItItit thatthat/whichthatthat优秀课件，精彩无限！241.是到戒烟的时候了。是到戒烟的时候了。(quit)It is time to quit smoking.2.让人惊讶的是在我这个年纪我依然让人惊讶的是在我这个年纪我依然 这么健康。这么健康。(It is amazing that.)It is amazing that at my age I am still so fit.优秀课件，精彩无限！25It seems stran

21、ge that the man who had delevoped communism should have lived and died in London.3.一旦你吸烟上了瘾一旦你吸烟上了瘾,你会发现要把它戒掉你会发现要把它戒掉 很难。很难。(addict.to;tough)Once you are addicted to smoking,you will find it tough to give it up.4.这似乎是一件怪事：这位发展了共产主义这似乎是一件怪事：这位发展了共产主义的人竟然在伦敦生活过，并且在伦敦去世。的人竟然在伦敦生活过，并且在伦敦去世。优秀课件，精彩无限！26

22、5.I (认为有必要)to take plenty of hot water every day.(think)6._(据说)the professor has already succeeded in carrying out this expriment.(say)7._to have succeeded(已成功)in carrying out this expriment.(succeed)8._It is likely for me_(我也许可以)to leave a message for her.(possible)9._It is likely that_(很可能)the thieves dont know how much it is worth.(likely)10._It is no use comlaining_(抱怨是毫无用处的)，and they never listen.(use)think it necessaryIt is said thatThe professor is said优秀课件，精彩无限！27it代词代词人称代词人称代词指示代词指示代词非人称代词非人称代词引导词引导词it 用在强调句中用在强调句中 it 用作形式主语用作形式主语it 用作形式宾语用作形式宾语小结：