为你解答。
May I play computer games now,Miss Wang?作否定回答 No，I'm afraid （not）.
我可以玩电脑游戏吗？恐怕不行。
You must hand in your homework before 7 am tomorrow.对before 7 am tomorrow提问
(When must you) hand in my homework?
你必须几点交作业？
No，I'm afraid not
when must you hand in my homework?
you can't play computer games now.
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