could have done和might have done的区别：含义不同、用法不同、侧重点不同
一、含义不同
could have done
本能够做
might have done
过去可能做
二、用法不同
could have done
could (不能用 can) have done 表示“过去本能够做某事却未做。”
注意：其否定形式 couldn't have done 没有虚拟语气的用法，couldn't have done 只能表推测，相当于 can't have done，意为：“过去不可能做了某事。”
I think that he couldn't have gone abroad. I saw him just now.
我认为他不可能出国了。我刚才还看见他了。
might have done
might (不能用 may) have done 表示“过去本可以做某事却未做。”
注意：其否定形式 might not have done 没有虚拟语气的用法，might not have done 只能表推测，相当于 may not have done，意为：“过去可能没有做某事。”
I can't find my keys. I might have left them at the school yesterday.
我找不到我的钥匙了。我可能昨天把他们落在学校了。
三、侧重点不同
could have done
后接完成时的用法：在否定句或疑问句中表示对过去发生过的事情的“怀疑”或“不肯定”的态度。
在肯定句中，可以表示过去可能做到而实际并没做到的事情，有“劝告”或“责备”的语气。
might have done
后接完成时的用法：表示对过去某事的推测，认为某一件事情在过去可能发生了。如果使用might，语气就比较婉转或更加不肯定。
可以表示过去本来可以做到而实际没有做到的事情，有“劝告”或“责备”的语气。
may / might have done 表示“过去可能做了某事”。may 比 might
表示的可能性在说话人看来稍大些。may/might not have done表示“过去可能没有做某事。”例如：
I can't find my keys. I may / might have left them
at the school yesterday. 我找不到我的钥匙了。我可能昨天把他们落在学校了。
John may/might not have passed the exam; he looks
very sad.约翰可能没有通过考试。他看起来很忧伤。
注意：may/might have done表推测不能用于疑问句中。
3. can/could have done
表推测一般用在否定句和疑问句中，表示不相信或怀疑的态度。
Can/Could he have passed the exam?他可能通过了考试吗？
I think that he couldn’t/can't have gone abroad. I
saw him just now.我认为他不可能出国了。我刚才还看见他了。
注：表示推测过去某动作发生的可能性时，就表示的可能性程度而言，must 最大，could 其次，may
更次之，might 最小。例如：
“I wonder how Tom knew about your past.”
“我想知道汤姆是怎么知道你的过去的。”
“He must / could / may / might have heard of it from
Mary.” “他肯定/很可能/可能/兴许（没准儿）已从玛丽那儿听说此事了。”本回答被提问者采纳
coulda done 另外还有 可以表示 capability 的一个意思。
could have done与might have done的区别是什么?
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