高中英语情态动词详解
1。 表示请求和允许: can, could , may, might. 过去式使语气更委婉,答语应用原形。
—-- Could I use your computer tomorrow morning?
--— Yes, you can.( 否定回答可用:No, I’m afraid not.)
2.表示推测:
理论可能性
can
可能性
肯定句
must, may ,might, could
疑问句
can
否定句
can’t (不可能),may not (可能不)
1)can表示理论上的可能性,指某事或情况可能发生,但并不说明实际上真的发生.
Children can be very tiring。
2)对现在事情的推测: 情态动词+do
对过去事情的推测: 情态动词+have done
对已完成事情的推测:情态动词+have done
3)反意问句:
He may know the plan, doesn't he?
You must have studied English before, haven’t you?
You can’ t have been caught in the rain last night, were you?
3.can & be able to
在肯定句中can表示有“能力”做,be able to表示通过想办法/努力等而能够做成了某一件事, 相当于managed to do…或succeeded in doing sth.
Birds can fly.
The fire spread through the hotel very quickly but everyone was able to get out。
4. may / might as well do sth “还是…好"、“不妨”
You might as well tell me the truth。 你还是把真相告诉我的好。
5。 must和have to
1) must表示的是说话人的主观看法, 而have to强调客观需要。
2)否定形式含义不同。mustn’t禁止,不许可,don't have to不必
3) must 偏要(做令人不快的事)eg。 Must you shout so loudly?
6。 shall和should
1) 表示说话人征求对方意见和向对方请示,用于第一、三人称。
When shall my father be able to leave hospital?
Shall 2) 用于第一、三人称2) 用于第二、三人称,表示说话人给对方的命令、警告、允诺或威胁以及说话人的决心。
You shall go with me (命令) / You shall have the book when I finish (允诺)
He shall be punished (威胁)/ Nothing shall stop me from doing it. (决心)
3) 规定(在条约、规则、法律)
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