情态动词的用法课件.ppt

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1、关于情态动词的用法课件第1页，此课件共18页哦一、一、“must have done”一定做过某事一定做过某事 表示对过去事情的肯定推测，该结构只用表示对过去事情的肯定推测，该结构只用于肯定句。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 servant.你和仆人说话，一定是发疯了。第2页，此课件共18页哦二、二、“cant have done”“couldnt have done”不可能做过某事不可能做过

2、某事 表示对过去事情的否定推测表示对过去事情的否定推测，“couldnt have done”较少使用较少使用。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史密斯先生不可能去北京了，我刚才还在图书馆见过他。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。玛丽不可能偷你的钱，她回家去了。第3页，此课件共18页哦三、三、“could have done”过

3、去可能做某事；本来能够做某事但没做过去可能做某事；本来能够做某事但没做 有两种用法，一种表示猜测，“过去可能做过某事”；另一种是虚拟语气，表示对过去事情的假设，意思是本来能够做某事而没有做。What could have happened?难道是发生了什么事吗？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。第4页，此课件共18页哦四、四、“can have done”较少使用到此结构较少使用到此结构 表示对过去行为的怀疑，用于疑问句，译成“可能做过吗？”。1.There is no light in

4、 the room.Can they have gone out?屋里没有灯，他们可能出去了吗？2.There is nowhere to find them.Where can they have gone?到处找不到他们，他们可能到什么地方去呢？第5页，此课件共18页哦五、五、“may have done”表示对发生过的事情的推测，意思是表示对发生过的事情的推测，意思是“可可能已经能已经”或或“也许已经也许已经”，用于肯定句中。，用于肯定句中。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

5、，他可能迷路了。第6页，此课件共18页哦六、六、“might have done”表示对过去事情的推测，表示对过去事情的推测，might与与may意思相同，但可意思相同，但可能性更小。多用于虚拟语气结构中。能性更小。多用于虚拟语气结构中。1.He might have given you more help,even though he was busy.(MET90)他或许会多给你一些帮助，即使他很忙。2.She might have 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

6、的成绩。第7页，此课件共18页哦七、七、“would have done”虚拟语气，表示对过去事情的假设，意思是“本来会做”。1.I would have told you all about the boys story,but you didnt ask me.我本来会告诉你这个小男孩的故事，但是你没有问我。2.Without your help,I wouldnt have achieved so much.没有你的帮助，我是不会取得如此大的成绩。第8页，此课件共18页哦八、“should have done”本来应该做某事，而实际没做本来应该做某事，而实际没做 否定式为否定式为“sho

7、uldnt have done”表示本来不应该做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。某事，而实际做了。含有指责对方或自责的含意。1.Tom,you are too lazy.The work should have been finished yesterday.汤姆，你太懒惰了，这项工作本来应该昨天就做完的。2.Look,Tom is crying.I shouldnt have been so harsh on him.看，汤姆哭了，我本来不应该对他如此严厉。第9页，此课件共18页哦九、九、“ought to have done”表示过去应该做而实际并没有做，译成表

8、示过去应该做而实际并没有做，译成“理应做理应做”，往往表示遗憾。与，往往表示遗憾。与“should+have+done”用法基本一样。用法基本一样。I ought to have gone home last Sunday.我理应上星期日回家。You ought not to have given him more help.你不应该帮助他那么多。第10页，此课件共18页哦十、十、“need have done”本来需要做某事而没有做本来需要做某事而没有做 否定式为“neednt have done”表示“本来不需要做某事而做了”。I neednt have bought so much wi

9、neonly five people came.我本来没有必要买这么多酒，只来了五个人。He need have hurried to the station.In that case,be wouldnt have missed the train.他本来需要快点去车站，那样的话，他就不会误了火车。第11页，此课件共18页哦 1-You didnt wait for Mr.Smith last night,did you?-Actually,we _.He didnt return home at all.A.couldnt have waited B.neednt have waitedC

10、.didnt need to wait D.should wait 2Harry _ have won the Physics competition easily yesterday,but he gave up.A.could B.might C.should D.must 第12页，此课件共18页哦 3-May I speak to your manager Mr.Smith at six oclock tonight?”-“Im sorry,Mr.Smith to a conference before then.”A.will have gone B.had gone C.would

11、 have gone D.has gone 4-Tom took away our teachers cell phone without being permitted.-Really?I cant imagine that he _ have done such a thing.A.must B.may C.can D.should 第13页，此课件共18页哦 5-Was it you that made the suggestion?-It have been.I cant remember.A.need B.must C.should D.may 6The weather turned

12、 out to be fine yesterday.I_ the trouble to carry my umbrella with me.A.should have taken B.could have takenC.neednt have taken D.mustnt have taken 第14页，此课件共18页哦 7He paid for a seat,when he _ have entered free.A.could B.would C.must D.need 8I didnt see her in the meeting room this morning.She at the

13、 meeting.A.mustnt have spoken B.mightnt have spokenC.cant have spoken D.shouldnt have spoken 第15页，此课件共18页哦 9-Hi,is that Peter Brown?-Sorry.You _ the wrong number.A.must call B.must have called C.should call D.should have called 10I was on the highway when this car went past followed by a police car.

14、They _ at least 150 kilometers an hour.A.should have been doing B.must have been doingC.could have done D.would have done 第16页，此课件共18页哦 11.He is not poor.You _ have lent him the money.A.cant B.neednt C.couldnt D.mustnt 12.There was plenty of time.You _ have hurried.A.wont B.mustnt C.neednt D.couldnt 13.They _ have finished the work yesterday,but it was raining hard.A.must B.could C.should D.might第17页，此课件共18页哦感谢大家观看感谢大家观看第18页，此课件共18页哦