Question

could have done 和 might have done 的区别

Answer 1

could have done 1.本可能做.,而实际上未做； 2.有可能做过某事,可能性较大
might have done 有可能做过某事,可能性较小.

would have done 常用在虚拟语气中，表示对过去情况的虚拟，意为会做某事，其实未做； should have done 结构也是一种虚拟，表达一种责备或内疚的语气，意为，本应该做某事，而实际上未做。

Answer 2

could have done 1.本可能做.,而实际上未做； 2.有可能做过某事,可能性较大
might have done 有可能做过某事,可能性较小.
希望可以帮到你!

Answer 3

程度不同
could have done 发生可能性更大