英语选修6unit3语法.ppt
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1、Grammar,The use of“it”,it 真实身份大揭底,.用作人称代词,.用作非人称代词,.It 作形式主语,.It 作形式宾语,.It 用在特定句型中,.It 用在固定习语中,“It”用作“人称代词”,1.It 指代上文中提到的物、事。(简化语言,避免重复)eg.My pen is missing.I cant find it.Xian isabeautifulcity,isntit?Is this your dog?No,it isnt.2.指代性别不明的人(常指baby)/说话人不清 楚性别的人(常在打电话、敲门等时):eg.The baby cried because it
2、 was hungry.There is a knock at the door.It must be the milkman.3.代替上文中的指示代词this/that-Who is that over there?-Its Helen.,.用作人称代词,“It”用作“非人称代词”,“it”表示天气、时间、日期、距离、价值、度量、温度、环境,季节,情况等(称为非人称的it):,It is about 5 kilograms.,How is it going?,.用作非人称代词,It is a bit windy.(指天气)It was nearly midnight when she cam
3、e back.Its May 1,2007.It is 150 yuan.It is summer now.,It was very quiet inthecaf.It is half an hourswalkto the city centre,(指时间),(指日期),(指价格),(指季节),(指度量),(指环境),(指距离),(指情形),“It”用作“形式主语”(8),it:形式主语 to do:真正主语(3)it:形式主语 doing:真正主语(1)it:形式主语 that从句:真正主语(4),adj.:legal,illegal,polite,impolite,possible,imp
4、ossible,clear,obvious,evident,certain,suitable,fit,useful,useless,etc.),一、,it+be+adj.(+for sb.)+to do sth.,“(对 sb.来说,)做某事是的。”,It is important for us to learn English well.,it+be+adj.+of sb.+to do sth.,Its kind of you to help me with the problem.Its generous(adj.慷慨的)of you to donate such a large of m
5、oney to charity.,(此处adj.通常为描述“人”的形容词:brave,kind,unkind,nice,rude,considerate,careful,careless,silly,foolish,stupid,clever,wise,crazy.),it+be+n.+to do sth.,It is a good idea to quit smoking before one comes pregnant.It is a pity/shame not to see that scholar in the flesh.,“做某事(真)是个”,常用n.有:good idea/a
6、 pity/a shame等,二、it+be+n./adj.+doing sth.,eg.Its no use crying over spilt milk.,Its a waste of time playing computer games.Its worth visting.,Its useless thinking too much.,Its no use/useless doing sth 做某事是无用的Its no good/a waste of time/fun/worth doing sth,It is very clear that hes round and tall li
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