Must I go to the supermarket now?的否定回答应用No,you mustn't.还是No,you don't have to.

Question

加原因。

Answer 1

你好

否定回答应该是：No, you don't have to.

Must I go to the supermarket now?

我现在得去超市吗？

No, you don't have to

不，你不用去。

mustn't  表示禁止，不准。 （所以不正确）

保证准确率~

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不明白请及时追问，满意敬请采纳，O(∩_∩)O谢谢~~

Answer 2

用No,you don't have to.或者No,you needn't.mustn't表示禁止的意思，而问句是我现在应该去超市吗？回答自然是不必。
单元能使你满意。

Answer 3

No,you don't have to.＝　you　needn＇t　

不必要
肯定的时候，要说，yes，　you　must．