He said we might leave.
③may / might 表示建议或请求,但might比may?更客气,意思更肯定而无过去时态的含义。
Yes, you can / may.
—May / Might I use your bike?
—
No, you mustn’t
(3)must
①must表示必须,应该,没有时态变化。如:
You must do everything as I do.
②must表示肯定的推测。如:
The light is still on, so he must be at home.
③mustn’t 表示禁止做某事。如:
You mustn’t smoke in the office.
(4)have to
have to 表示“必须、不得不”,是由于某种外界(客观)原因而“必须”,“不得不”做某事,也可表示经常的或习惯性的事“必须”做。have to的否定形式表示不必。have to可用于多种时态中。如:
You will have to clean your own boots when you join the army.
I have to be at my office every evening.
(5)should / ought to
①should和ought to表示应当、应该,前者比后者语气轻。如:
You should / ought to work hard.
②should / ought to work hard.
Since she is not here, whe should / ought to be in the classroom.
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