1.___I leave school now?NO. you ___clean the classroom first.用 can. can't . may. must, mustn't. 填It's time for class. you___stop playing basket-ball, you __be late for class.

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1.___I leave school now?NO. you ___clean the classroom first.用 can. can't . may. must, mustn't. 填It's time for class. you___stop playing basket-ball, you __be late for class.

1.___I leave school now?NO. you ___clean the classroom first.用 can. can't . may. must, mustn't. 填It's time for class. you___stop playing basket-ball, you __be late for class.
1.___I leave school now?NO. you ___clean the classroom first.用 can. can't . may. must, mustn't. 填
It's time for class. you___stop playing basket-ball, you __be late for class.

1.___I leave school now?NO. you ___clean the classroom first.用 can. can't . may. must, mustn't. 填It's time for class. you___stop playing basket-ball, you __be late for class.
1.Can must
-现在我能离开学校吗? -不行,你要先把教室打扫了.
2.must may
上课的时间到了.你必须停止打篮球,你可能会迟到.

must can't
已经要上课了, 所以必须停止打篮球,因为你不能迟到

can must

Can I leave school now? Nope. You must clean the classroom first.
You must stop playing basketball. You can be late for class.