For your health, I’m afraid you ______.
A. can
B. may
C. must
D. had to
二.情态动词后跟完成式和进行式的用法
1. 情态动词后跟完成式,表“原本应该干某事,而实际上没干”
I should have finished the work earlier.
He isn’t here. He must have missed the train.
2. 情态动词后跟进行式,表示“想必正在……”,“可能正在……”,“应当正在”等意。
It’s twelve o’clock. They must be having lunch.
They may be discussing this problem.
He can’t be telling the truth.
She shouldn’t be working like that. She’s still so weak.
三.情态动词的同义转换.
1. can = be able to
2. must = have to
3. needn’t = don’t have to
4. need do sth = need to do sth .
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