情态动词+have-done的用法课件

1、“情态动词+have done”的用法 一、 “must have done” 一定做过某事表示对过去事情的肯定推测，该结构只用于肯定句。 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 servant. 你和仆人说话，一定是发疯了。二、 “cant have done” “couldnt have done” 不可能做过某事表示对过去事情的否定推测，“couldnt have done”较少使用。1. Mr.

2、 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。 “can have done” 表示对发生过的事情的推测，用于疑问句中。 Its so late. Where can she have gone? 天晚了，她可能去哪儿了呢？四、 “may have done” 表示对发生过的事情的推测，意思是“可能已经”

3、或“也许已经”，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，他可能迷路了。五、 “might have done” 1)表示对过去事情的推测，might与may意思相同，但可能性更小。2)用于虚拟语气中,意思是：“本来可能做某事，事实上却没做”1. He might have given you more help, even though he was busy. 他或许会多给你一些帮助，即使他很忙。2. She might have achieved greater

4、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。六、 “would have done” 虚拟语气，意思是“本来会做某事，但事实上没做”。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。八、 “ought to ha

5、ve done” 表示过去应该做而实际并没有做，译成“理应做”，往往表示遗憾。与“should+have+done”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。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 ha

6、ve waitedC. didnt need towait D. should wait2Harry _ have won the Physics competition easily yesterday, but he gave up.A. could B. might C. should D. must 5- Was it you that made the suggestion?- It have been. I cant remember.A. need B. must C. shouldD. may6The weather turned out to be fine yesterda

7、y. I_ the trouble to carry my umbrella with me .A. should have taken B. could have takenC. neednt have taken D. mustnt have taken 7He paid for a seat, when he _ have entered free.A. could B. wouldC. mustD. need8I didnt see her in the meeting room this morning. She at the meeting .A. mustnt have spok

8、en B. mightnt have spokenC. cant have spoken D. shouldnt have spoken 9- Hi, is that Peter Brown?-Sorry. You _ the wrong number .A. must call B. must have called C. should call D. should have called10I was on the highway when this car went past followed by a police car . They _ at least 150 kilometer

9、s an hour .A. should have been doing B. must have been doingC. could have done D. would have done 11. He is not poor. You _ have lent him the money.A. cant B. neednt C. couldnt D. mustnt12. There was plenty of time. You _ have hurried.A. wont B. mustnt C. neednt D. couldnt13. They _ have finished the work yesterday, but it was raining hard.A. must B. could C. should D. might14. I _ here in time, but I met an old friend of mine. I stopped and talked with him for some time.A. shouldnt have come B. m