done做形容词adj.已完成的；煮熟的；合乎礼仪的；合乎规矩的感叹词表示接受建议）动词做（do的过去分词）；干。
词性
adj.完成的；做好了的；煮熟的；合乎礼仪（规矩）的；不再发生的；为社会所接受的（非正式）。
int.感叹词，（表示接受建议）行，好
v.做（do 的过去分词）
n. (Done) （美、英、罗马尼亚）多恩（人名）
区别
简介
“would+have+done”虚拟语气，表示对过去事情的假设，意思是“本来会做”。
例句
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。
“could+have+done”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。
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。
相关知识
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 servant.你和仆人说话，一定是发疯了。
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 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。
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？
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。
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.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。
should+have+done
意思是“本来应该做某事，而实际没做。”“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。
3 do you feel guilty when you have done something youshould"t.
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。
need+have+done
表示本来需要做某事而没有做。“needn't+have+done”则表示“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。
would like to have done sth.本打算做某事
I would like to have read the article,but I was very busy then.
would rather +have done.当时宁愿做了或没做
I would rather have refuse his offele.
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