Question

must开头的一般疑问句如何回答?

Answer 1

肯定回答是yes,you must
否定回答是no,you needn't or no,you don't have to.

Answer 2

肯定yes，you must/have to
否定 no，you needn't

Answer 3

Yes, 主语+must。
NO,主语+mustn't。