? 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。
? 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。
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”。
? 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。
八、 “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.பைடு நூலகம்Look, 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。
九、 “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。
2. You must have been mad to speak to the servant. 你和仆人说话，一定是发疯了。
二、 “can‘t have done” “couldn't have done” 不可能做过某事
? 表示对过去事情的否定推测 ，“couldn't have done”较少使用 。
六、 “might have done”
? 表示对过去事情的推测， might 与may 意思相同， 但可能性更小。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。
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。
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”。
? 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。
四、 “can have done” 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 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？
“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。
? 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
五、 “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。
三、 “could have done”
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。