（公开课）高中英语复习北师大版《情态动词+have-done》课件-最新.ppt

1、情态动词第二讲情态动词第二讲 情态动词+have done情态动词情态动词have done情态动词情态动词have done Review Must,may和cant+do/be doing 是对什么时候的事情进行推测？1.Tom cant be at home at present.There is nobody to answer the phone.2.My sister went to the cinema an hour ago.Now she must be seeing a film.must+have+done 表示对过去事情的肯定推测，译成一定做过某事一定做过某事，该结构只

2、用于肯定句。1.It must have rained last night,for the ground is wet.昨晚一定下雨了，因为地面还是湿的。2.You must have been mad to speak to the criminal.你和罪犯说话，一定是发疯了。may/might+have+done 表示对发生过的事情的推测，意思是“可能已经”或“也许已经”，用于肯定句中。肯定句中。What has happened to George?I dont know.He may have got lost.乔治发生了什么事？我不知道，他可能迷路了 She might have

3、 achieved greater progress,if you had given her more chances.如果你多给她点机会，她可能已经取得更大的成绩。cant+have+done 表示对过去事情的否定推测，译成“不可能做过某事”1.Mr.Smith cant have gone to Beijing,for I saw him in the library just now.史密斯先生不可能去北京了，我刚才还在图书馆见过他。2.Mary cant have stolen your money.She has gone home.玛丽不可能偷你的钱，她回家去了。could+ha

4、ve+done 是虚拟语气，表示对过去事情的假设，意思是本来能够做某事而没有做.He could have passed the exam,but he was too careless.本来他能够通过考试，但是他太粗心。Should/shouldnt+have+done should+have+done意思是“本来应该做某事，而实际没做。”“shouldnt+have+done”表示本来不应该做某事，而实际做了。含有指责对方或自责的含意。The work should have been finished yesterday.这项工作本来应该昨天就做完的。Tom is crying.I sh

5、ouldnt have been so harsh on him.汤姆哭了，我本来 不应该对他如此严厉。neednt have done 表示“做了本来不必做的事情”，通常不用于肯定句。例如：Its only five minutes walk.We neednt have taken a taxi.只有5分钟的步行路程，我们本不必乘出租车的。It is warm today.You neednt have worn your coat.今天天气暖和，你本来不必穿大衣的。情态动词have done 高频考点高频考点深化突破深化突破 考点诠释考点诠释 对点演练对点演练 should/wouldc

6、ouldneednt情态动词have done 高频考点高频考点深化突破深化突破 mustcouldneedcouldmightmust考点诠释考点诠释 对点演练对点演练 1.Do you know where David is?I couldnt find him anywhere.Well,he _ have gone far,for his coat is still here.A.shouldnt B.mustntC.cantD.wouldnt 2.He _ you more help,even though he was busy.A.might have given B.might

7、 not give C.may not have given D.may give 3.There was plenty of time.She _.A.mustnt have hurried B.couldnt have hurried C.mustnt hurry D.neednt have hurried 4.Tom graduated from college at a very young age.Oh,he _ have been a very smart boy then.A.could B.Should C.might D.must 5.My English-Chinese dictionary has disappeared.Who _ have taken it?A.shouldB.mustC.couldD.shall 6.I really worried about you.You _ home without a word.A.mustnt leave B.shouldnt have left C.couldnt have left D.neednt leaveGoodbye!