霍建华的素颜照片:·请问,must如何构成反意疑问句?

反意疑问句必须前后一致.若是否定回答,另当别论.如:
Must I be at home?
No, you needn't.
同意楼上的意见。反意疑问句应该是mustn't he?
回答者：joannazpsj - 秀才 二级 12-12 22:17

应该改为
isn't he?

请看详细解释
陈述部分有must 的疑问句，疑问部分根据实际情况而定。
He must be a doctor, isn't he?
You must have studied English for three years, haven't you? / didn't you?
He must have finished it yesterday, didn't he?

must在表"推测"时，根据其推测的情况来确定反意疑问句。
He must be there now, isn't he?
It must be going to rain tomorrow, won't it?

参考资料：http://www.hongen.com/eng/pub/yufac/1305.htm

情态动词 must 的反意疑问句

陈述部分有must，且表示"必须"时，附加疑问句部分用mustn't，`如果表示"必要"则用needn't。
陈述部分中是mustn't表示"禁止"时，附加疑问句部分用must。

陈述部分中的must表示"一定"、"想必"等推测意义时，附加疑问句部分而是根据陈述部分的谓语动词或其助动
词来定。

They must clean the floor, mustn't they/needn't they?

他们必须擦地板，是不是？

We must stay at home, mustn't we?

我们必须留在家里，是不是？

We mustn't be late, must/may we?

我们不许迟到，是不是？

They must work hard, mustn't they?(必须)

He must be a visitor, isn't he?(对现在情况的推测)

You must have seen him at his birthday party yesterday, didn't you?(对过去情况的推测,且句中有过去的时间状语)

You must have seen him at his birthday party,haven't you?(强调动作的完成)

不可以太绝对 也有前后都用must的情况 不7能一概而论 比如 表达对对方的质问，抗议 等感情
eg. A-You must wash clothes for me today.
B-oh I must,must I?
具体情况要看语气场合上下文和英美人士说话习惯而定 学英语单纯凭借语法 就显得呆板而匠气了。