Must we hand in our homework today? - Yes, you must. No, you neednt.
C. 表示推测指可能时,用must; 指不可能,不一定时用cannot/could not, 有时也用may not, 口气较委婉,意为也许不。 That must be a mistake. No, it cannot be a mistake. It must not be a mistake
D. 表示推测也常用may,指可能否定式同上。 He may be right/ He cannot be right. He may not be right.
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