虚拟语气could/should/would/might +have done 用法的差别? 1.It's a great pity that you _____ have done such a thing. A.ought to B.should C.could D.might 2.As I have nothing to do now,I _____ as well go with you. A.should B.would C.could D.might 3._______ he could late ,give him the message. A.Should B.Would C.Had D .Did
could have done本来能够做什么,事实上没做 should have done本来应该做 would have done将来可能做 might have done可能做了 1. 很可惜你没做那件事,事实上你能够做的,所以选C 2. might as well 做什么更好,既然我无事可做,还不如跟着你好了 3. B, 对将来时的虚拟,他可能会迟到,告诉他这个消息