题目

would have done,might have done,could have done,should have done分别表示什么意思?

提问时间：2020-06-05

答案

一、在虚拟语气中的用法1.should have done 表示“过去本应该做某事却未做.”其否定结构 shouldn't have done 表示 “过去本不该做某事却做了.”2.ought to have done 表示“过去本应该做某事却未做.”其否定结构 ou...