should have done 和 ought to have done 有什么区别呢?

来源：学生作业帮编辑：拍题作业网作业帮分类：英语作业时间：2024/05/15 01:44:00

should have done 和 ought to have done 有什么区别呢?
在虚拟语气的用法中shuold have done和ought to have done都表示“过去本应该做某事却未做”,那么两者有什么区别?是不是可以换用?

1.should
should作情态动词,三种人称,单、复数通用.主要用法有：
1）表示“义务；责任”,可译作“应该”.例如：
This is the lesson we should remember.这是我们应当记住的教训.
2）表示“可能性；推测或理论”,相当于汉语的“可能；该”.例如：
They should be there by now,I think.
3)说话人在提出意见、请求、建议时,可用should表示委婉、谦逊的语气,有时相当于汉语的“可；倒是；想”等.例如：
I should say it would be better to try it again.
2.ought to
ought to无时态和人称变化,只有ought to一种形式,后面须跟动词不定式,表示“有义务或责任”做某事,语气比should强,也可表示“劝告”.例如：
You ought to obey your parents.
I knew that I ought not to open the letter,so I didn't.
ought to比should语气更强烈
ought to的否定表示做某事一定是错的
should表示某动作不一定要做
做肯定用时
should表示“劝告”、“建议”、“应当”
ought to应接动词原形表示“有义务”或“必要”做某事
should指的是主观
ought to更偏向客观
一般二者可以互相转换（口语中多用should)

关于英语ought to have done 与should have done的区别有need have done should ought to have done Ought to have done .must have done.should have done的区别 should have done 可以换成 ought to have done嘛? ought to have done和should have done都是虚拟语气,只是前者 were to have done 和 should have done 都表示虚拟的本应该有什么去区别么? should have done ;could have done; might have done 有什么区别 have sth done 和have sth to be done 有什么区别呢?Do you have any le to be done、being done 和have been done 有什么区别啊~ can have done和 could have done有什么区别? must have done和have done有什么区别 should have done 和should not have done的区别