如果用must 提问一般疑问句，否定回答用什么？

Question

如题：Must they clean the classroom now?
否定回答是什么？

Answer 1

举例吧：

Must we register before using the site?
-Yes, you must. / No, you needn't.

关于Must提问的一般疑问句，否定答案用need代替must。

Answer 2

No, they needn't.
No, they don't need to.
No, they don't have to.
一般是这三种

Answer 3

那要先看这个句子的句式，是一般疑问句，还是特殊疑问句,还是选择疑问句。既然都用must了，那么……什么句式你自己也知道。所以是yes or no来做肯定或否定回答。那么……否定回答就用：No,…need dont./No,…neend’t.

Answer 4

No, they don't need to.
No, they don't have to.
No, they shouldn't.

Answer 5

yes,they need
no,they needn't