would have done,might have done,could have done,should have done分别表示什么意思?
人气：163 ℃ 时间：2019-08-18 07:42:18
解答
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...
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