must在反义疑问句中的用法?must反义疑问否定和肯定、还有不同意义“必须”“一定”这些情况的用法

Question

must在反义疑问句中的用法?
must反义疑问否定和肯定、还有不同意义“必须”“一定”这些情况的用法

Answer 1

必须（注意其肯定回答和否定回答）
I -must remind him of the truth,mustn't
- Yes,you must./ No,you needn't.
2 A:Everyone must work for a better tomorrow,mustn't they?
B:Yes,they must.
一定 (注意助动词的使用)
John must have seen the film,hasn't he?
John must have seen the film yesterday,didn't he?
John must have been to Japan before,hasn't he?
John must have been in Japan last week,wasn't he?
John must have left before Mary arrived,hadn't he?