should/could/must/might have done用法?

来源：学生作业帮编辑：神马作文网作业帮分类：语文作业时间：2024/11/11 16:51:13

should/could/must/might have done用法?
请详细讲解一下这几种用法和区别,最后举一些例子.
最后把它们的否定式意义再讲解一下~

should have done表示本应做而没做
could have done表示本可以做而没做
must have done表示对过去事实的肯定判断,语气较重,即很肯定
might have done=may have done对过去事实的肯定猜测,语气较轻
eg.1.You should have swpet the floor.你本该扫地而没扫.（含责备语气）
2.She could have done better.她本来可以做得更好的.（而实际上做得不够好）含惋惜语气
3.It must have rained yesterday.昨儿个一定下雨了.(看到外面有很明显的下过雨的痕迹时说)
4.He might have had a fever.他可能发烧了吧.（人没来,而谁也不知道原因,就随便猜猜）
should not have done本不该做而做了
could not have done本不可以做而做了
mustn't是禁止好像没有否定式吧
might not have done对过去事实的否定判断

should/could/must/might have done用法? should/must/would/could/might/may have done的问题! 必修三英语语法,should have done ,could have done,might,must,needn't 区别could,might,would,should have done 虚拟语气could/should/would/might +have done 用法的差别? would/could//should/must have done 虚拟语气中would could should might have done与had done都是表示过去,在用法上有 would have done,might have done,could have done,should have 求could 、should have done的用法. should have done ;could have done; might have done 有什么区别情态动词中 should might could would + have done 与它们在if 虚拟语气中用法有 could/might/may/would/must/should have+过去分词