shouldn't have done couldn'd have done should have done could have done 他们的意思到底 实际有没有做
问题描述：
shouldn't have done couldn'd have done should have done could have done 他们的意思到底 实际有没有做
就是比如说第一个的意思 到底实际上有没有做
很纠结啊
答
1.should have done 本应该做而实际未做,表示后悔的虚拟语气.2.shouln't have done 本不应该做而实际做了.如：he was very sad now. I shouldn't have scolded him.3.could have done 表示本可以（有能力）做,而...你确定吗 第四个和前三个不一样？？？