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mayhavedone和mighthavedone
请讲讲情态动词表推测的用法
答:
英语中只有must,
may
,
might
,may用于推测。又不是不可以。这五种表情的语气依次降低:必须:肯定(以肯定的语气)阿美:也许吧(不确定)可能:可能(比可能弱)可能 不是:也许不是(否定)不能:肯定不能(必须的反义词)猜猜现在“必须”、“可能”、“可能”、“可能”是怎么回事 而不是不能+做或者是。她...
couldn't
have done
表示什么
答:
表示:不可能做到,本来做不成的,过去不可能做。例句:I don't want to take away from his achievements, but he couldn't
have done
it without my help.我不想贬低他的成就,但是如果没有我的帮助,他是做不成的。短语:couldn't 不能 ; 无法 ; 听不清 ; 什么办法也没有 cannot couldn...
could
have done
的意思
答:
could
have done
本来能做成的(却没做成)双语例句:1.But we could have done it all so much better.但是,我们本可以把这一切做得更好。2.If you do a good job, you
may
tell yourself that it wasn’t good enough or thatanyone could have done as well.比如你完成了一项出色的工作...
can't
have done和
couldn‘t have done 的区别
答:
couldn't
have done和
can't have done都表示不可能,是对过去情况的推测。例句:he can't / couldn't have worked out the problem.他不可能解决了这个难题。can't 也可以用于对现在情况推测,couldn't have done可以用 和过去事实相反的虚拟语气。例如:if you hadn't gone to the party,you c...
havedone
等等用法
答:
不用,一般情况下,情态动词后面接动词原型.你所说的固定用法是指的虚拟语气,从中也能看出后面接的
have
也是原型.
mustn't
have done和
can't have done的区别最好有例子
答:
They may not have known it beforehand.You
might have
read about it in the papers.四、“need + have + 过去分词”表示过去做了不必做或不需要做的事情,或过去做某事纯属多余.如:Need they
have done
it last week?I needn't have bought so much wine—only five people came.五、“...
canhavebeen
与mayhavedone
区别
答:
区别是用法不同。can have been意思是“可能是”,一般用在被动句中,比如He can have been delayed by heavy snow.(他可能被大雪耽搁了)
may have done
意思是“可能已经完成”,一般用在主动句中,比如He may have finished his home work.(他可能已经完成了家庭作业)
might
be
和 may have
been的区别
答:
情态动词表推测 因为may后面要加动词原形 所以~前者是对过去事情的推测 而后者是对现在的事情或者正在发生的事情进行的推测 前者:may +do---may +did 矛盾 所以将did 换成have done,因为在英语中过去时和完成时可以替换 所以就有了
may have done
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can/
may
/
might
/
have
to/must怎样区分?
答:
\x0d\x0a2.比较
may和might
\x0d\x0a(1)表示允许或请求;表示没有把握的推测;may放在句首,表示祝愿。\x0d\x0a注意:might表示推测时,不表示时态。只是可能性比may小。\x0d\x0a3.比较
have
to和must\x0d\x0a(1)两词都是'必须'的意思,haveto表示客观的需要,must表示说话人主观上...
should
have done 和
ought to have done 有什么区别呢?
答:
should
have done 和
ought to have done的区别为:一、指代不同 1、should have done:本应该。2、ought to have done:应该做的。二、侧重点不同 1、should have done:should作情态动词,三种人称,单、复数通用。2、ought to have done:ought to无时态和人称变化,只有ought to一种形式,后面...
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