“情态动词+have done”的用法.

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1 “情态动词+have done”的用法

2 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。

3 二、 “can’t have done” “couldn’t have done” 不可能做过某事
1. Mr. Smith can’t 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 can't have stolen your money. She has gone home. 玛丽不可能偷你的钱，她回家去了。

4 三、 “could have done” 1)表示猜测，“过去可能做过某事”,多用于疑问句；
2)用于虚拟语气，意思是“本来能够做某事而没有做”。　 What could have happened? 难道可能发生了什么事吗？ This glass is cracked. Someone could have dropped it. 这个玻璃杯破了。可能是谁把它掉在地上了。 　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。

5 “can… have done” 表示对发生过的事情的推测，用于疑问句中。
It`s so late. Where can she have gone? 天晚了，她可能去哪儿了呢？

6 四、 “may 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。
—What has happened to George? —I don't know. He may have got lost. —乔治发生了什么事？ ——我不知道，他可能迷路了。

7 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 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。

8 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 boy's story, but you didn't 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 wouldn't have achieved so much. 没有你的帮助，我是不会取得如此大的成绩。

9 七、 “should have done” 本来应该做某事，而实际没做
否定式为“shouldn’t 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。 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 shouldn't have been so harsh on him. 看，汤姆哭了，我本来不应该对他如此严厉。

10 　八、 “ought to have 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。

11 十、 “need have done” 本来需要做某事而没有做
否定式为 “needn’t have done” 表示“本来不需要做某事而做了”。 I needn’t have bought so much wine—only 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 wouldn't 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。

12 1．---You didn’t wait for Mr. Smith last night, did you?
---Actually,we ______. He didn’t return home at all. A. couldn’t have waited          B. needn’t have waited C. didn’t need to wait              D. should wait 2．Harry ______ have won the Physics competition easily yesterday, but he gave up. A. could   B. might   C. should   D. must

13 3．---May I speak to your manager Mr. Smith at six o’clock tonight ?”
---“I’m sorry, Mr. Smith         to a conference before then.” A. will have gone      B. had gone    C. would have gone      D. has gone 4．---Tom took away our teacher’s cell phone without being permitted. --- Really? I can’t imagine that he _______ have done such a thing. A. must     B. may      C. can      D. should

14 5．--- Was it you that made the suggestion?
--- It        have been. I can’t remember. A. need      B. must     C. should      D. may 6．The weather turned out to be fine yesterday. I_________ the trouble to carry my umbrella with me . A. should have taken             B. could have taken C. needn't have taken            D. mustn't have taken

15 7．He paid for a seat, when he ______ have entered free.
A. could    B. would    C. must    D. need 8．I didn’t see her in the meeting room this morning. She       at the meeting . A. mustn’t have spoken    B. mightn’t have spoken C. can’t have spoken       D. shouldn’t have spoken

16 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 10．I was on the highway when this car went past followed by a police car . They ______ at least 150 kilometers an hour . A. should have been doing             B. must have been doing C. could have done                    D. would have done

17 11. He is not poor. You ____ have lent him the money.
A. can’t B. needn’t C. couldn’t D. mustn’t 12. There was plenty of time. You ___ have hurried. A. won’t B. mustn’t C. needn’t D. couldn’t 13. They ____ have finished the work yesterday, but it was raining hard. A. must B. could C. should D. might

18 14. I ____ here in time, but I met an old friend of mine
14. I ____ here in time, but I met an old friend of mine. I stopped and talked with him for some time. A. shouldn’t have come B. must have come C. needn’t have come D. could have come 15. I didn’t hear the phone. I ____ asleep. A. must be B. must have been C. should be D. should have been