couldn't have done和couldn't do的区别

来源：学生作业帮编辑：搜狗做题网作业帮分类：英语作业时间：2024/07/24 12:03:50

前者是情态动词加现在完成时,表对过去的推测,意思是本不能做某事,实际上做了
后者就是一般的情态动词,表不能做,或者表推测,不可能会做
再问：那在这个句子里呢？还是不怎么明白。 Without your direction,I_____such a high mark. 是用couldn't have got还是couldn't get?
再答：是couldn't have got 要是没有你的指导，我就不会获得高分（实际上获得了） without 是虚拟语气的提示词 couldn't have done =本不能获得高分（实际上获得了） shouldn't have done =本不应该做，实际上做了
再问：谢谢啦。再问下，这句话什么意思？？？I couldn't get such a high mark。
再答：那就不是虚拟陈述一个事实，我没有获得高分-----获得了低分你看看，是不是事实相反了？

couldn't have done? couldn't have done与couldn't区别求两组英语句型的解释could have done 和 couldn't have doneshould have do couldn't have done和mightn't have done有什么区别情态动词can't have done 和couldn't have done 有什么区别吗 can have done和could have done有无区别?can't have done和couldn't h couldn't have done 有不可能的意思吗?问题二它和cant have done的区别 didn't 和couldn't的区别, couldn't have done 表示什么 couldn't have done,"不可能已经"? they couldn't have done better是什么意思 should have done和shouldn't have done,couldn't have