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shoulD/CoulD/must/might hAvE DonE用法?

may/might have done有两个意思: 本来可以干......; 2. 推测过去所发生的事情。例如: You come late again. You may/might have get up early.你又迟到了,你本来可以早一点起床。 He may/might have stayed up last night.昨晚他可能熬夜了。

一、“would+have+done”虚拟语气,表示对过去事情的假设,意思是“本来会做”。 1. I would have told you all about the boy's story, but you didn't ask me. 我本来会告诉你这个小男孩的故事,但是你没有问我。 2. Without your help, I wouldn'...

(一)情态动词详细用法讲解 一,概说:情态动词(ModalVerb):情态动词用来表示说话的人对所叙述的动作或状态的看法,如表示命令,允诺,请求,拒绝,愿望,义务,必要,可能,敢于,需要等 情态动词主要有:can/could;may/might;must/ought; n...

should have done“本应该做某事” might have done“可能做过某事” could have done“本可以做到某事” would have done“本愿意做某事” 都是表示与过去事实相反。if条件句中的虚拟基本含义相同,只是要注意主从句时态一致。

情态动词所表达的可能性程度:must/can't  should/shouldn't  might/may (not) 另外两个"类情态词的形式:"need/needn't; have to/don't have to  最自然的虚拟状态:由should/would+原型时态(不含时间只含状态) 本质...

1. must have done 表示对过去某事的肯定猜测,译为:过去肯定做了某事。不存在 mustn't have done 的形式。其否定或疑问形式须用 can(could) 来表示. 例如: Since the road is wet, it must have rained last night. 既然路是湿的,那昨天晚上...

情态动词加have done都是对过去事情的推测,区别只在于情态动词的不同 一、 “must+have+done” 表示对过去事情的肯定推测,译成“一定做过某事”,该结构只用于肯定句。 1. It must have rained last night, for the ground is wet. 昨晚一定下雨了...

是的 must have done表示对过去某事的肯定猜测,译为:过去肯定做了某事。不存在 mustn't have done 的形式。其否定或疑问形式须用 can(could) 来表示. 例如: Since the road is wet, it must have rained last night. 既然路是湿的,那昨天晚...

情态动词有can (could), may (might), must, have to, shall (should, will (would), dare (dared), need (needed), ought to等。 情态动词无人称和数的变化;不能单独使用,必须与其后的动词原形构成谓语 一、 can, could 1) 表示能力(体力、...

这类词都属于情态动词 下面普及下其用法 情态动词是一种本身有一定的词义,表示说话人的情绪,态度或语气的动词,但不能单独作谓语, 只能和其他动词原形构成谓语. 情态动词数量不多,但用途广泛,主要有下列: can (could), may (might), must, need, ...

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