情态动词+have_done结构
一、“must+have+done”
表示对过去事情的肯定推测，译成“一定做过某事”，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 rvant. 你和仆人说话，一定是发疯了。
公德与私德
二、 “can't+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 can‘t have gone过春节儿童画 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。
三、 “can+have+done”
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？
四、 “八月什么星座could+have+done”
是虚拟语气，表示对过去事情的假设，译成“本来能够”做某事而没有做。
1. He could have pasd the exam, but he was too careless.
本来他能够通过考试，但是他太粗心。
五、小妹妹送我的郎 “may+have+done”
表示对过去发生的事情的推测，译成“可能已经”，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。
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。译成“可能已经”，用于肯定句中。
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。
七、 麻辣卤鸡爪“would+have+done”
虚拟语气，表示对过去事情的假设，意思是“本来会，，，”。
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。
八、 “should+have+done”
对过去事情的埋怨，意思是本来应该做某事，而实际没做。译成“本应该“
“shouldn‘走进新农村t+have+done”表示本来不应该做某事，而实际做了。含有指责的意思。译成“本不该“
度假岛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 社交英语shouldn't have been so harsh on him.
