You must do you are homework on time改为祈使句 并讲出为什么,

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You must do you are homework on time改为祈使句 并讲出为什么,

You must do you are homework on time,needn't you?

1、must表示“必须”时,疑问部分用mustn’t.如:
We must keep
it as a secret, mustn’t we? 我们必须对此保守秘密,是吧?
2、must表示“有必要”时,疑问部分用needn’t
.如:
You must
leave a little earlier,needn’t you? 你有必要早点出发,对吗?
3、must表示“一定、肯定”等推测意义时,疑问部分一般不用情态动词,而和must后的动词相一致.如:
He must play basketball very well, doesn’t he? 他篮球肯定打得很好,是吗?