must改成一般疑问句
must做比须时,否定是must not或mustnt;表示推测时,通常与be连用,否定用cant be。
1.对于must开头一般疑问句,若要作否定回答,可用needn\'t,不用mustn\'t。如\"Must I come over tonight?\"\"No,you needn\'t.\"“我今晚必须过来吗?”“不必”
2.在回答引出的`问句时,如果是否定的,不能用mustn’t(禁止,不准),而用needn’t, don’t have to(不必).
- Must we hand in our exercise books today?
-Yes, you must.
- No, you don’t have to / you needn’t.