虚拟语气中什么时候用should have done 什么时候用should be done

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/25 18:53:25

1 should have done
是含有虚拟条件句的
主句是第一人称时,并且是与过去相反的假设.
如：
If I had met her yesterda,I should (=would) have told her about the news.
should have done“本应该做”,含有“责备”之意.
You should have come earlier.你本该来早些.
2.should be done
是含有虚拟条件句的
主句是第一人称时,并且是与现在相反的假设的被动语态.
The book should be kept if it were not sold.
还有可能用在名词从句的虚拟语气
She suggested that the work (should) be done at once.

虚拟语气中,什么时候用would have done,would do 虚拟语气 should have done 与 could have done 虚拟语气的主句,什么时候用would do?什么时候用would have done? 虚拟语气中的would have done 与could have done结构有什么区别?什么时候用would什么虚拟语气什么时候用should do什么时候用did 虚拟语气什么时候用 should 什么时候用过去式? 虚拟语气中should什么时候可以省略? 情态动词+have done什么时候用是只用于虚拟语气里吗英语：should have done是否用于虚拟语气? 虚拟语气什么时候省略should 在虚拟语气中,什么时候用would＋动词原形,什么时候用should＋动词原形 can't be done.should be done.should have done