You cannot do it well.
You can go now.
Can I do it in this way?
You could have finished the work, but …
3. may 与might(过去式)
1) 表示允许。“可以”
May I come in?
He asked me if he might come in.
---May I come in?
---Yes, please. Certainly.
---No, please don’t. No, you mustn’t.
2) 表示可能性。
He may be at home. = Maybe he is at home.
He may be having lunch. = Maybe he is having lunch.
might 用在虚拟条件句中。
If he were here, you might get some help from him.
4. must
1) must 侧重主观看法,have to 强调客观需要。
We must do our work harder.
We have to hand in our homework before 6.
2) 在回答must 引起的问题时,否定回答用needn’t 或don’t have to .
---Must I get there before 12 o’clock?
---No, you needn’t.
3) mustn’t “一定不要,不可以”表示不许可. can’t (couldn’t)表示不可能,表示对某种情况的推测。
You mustn’t talk like that.
We mustn’t stay here any longer.
---Can I smoke here?
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