You have worked hard all day.You must be tired.你辛苦干一整天,一定累了。(对现在情况的推测判断)
He must be working in his office. 他一定在办公室工作呢。
比较:
He must be staying there.
他现在肯定呆在那里。
He must stay there.
他必须呆在那。
3) must 表示对已发生的事情的推测时,must 要接完成式。
I didn't hear the phone. I must have been asleep.我刚才没有听到电话,我想必是睡着了。
4) must表示对过去某时正发生的事情的推测,must 后面要接不定式的完成进行式。
---Why didn't you answer my phone call?
---Well, I must have been sleeping, so I didn't hear it.
5) 否定推测用can't。
If Tom didn't leave here until five o'clock, he can't be home yet.如果汤姆五点才离开这儿,他此时一定还未到家。
表示推测的用法
can, could, may, might, must 皆可表示推测,其用法如下:
1)情态动词+动词原形。
表示对现在或将来的情况的推测,此时动词通常为系动词。
I don't know where she is, she may be in Wuhan.
2)情态动词+动词现在进行时。
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