Question

由must提问的反意疑问句什么时候用mustn’t 什么时候用doesn‘t?

Answer 1

当陈述句中must表示“必须”,mustn't表示“禁止”时,附加问句分别用mustn't和must.
当陈述句中must表示“有必要”时,附加句用needn't
I must say something at the meeting,needn't i?
当陈述句中must表示“一定”,“想必”等推测意思时,附加句一般要根据must后面的动词,采用相当的be或助动词形式.
1）He must be in the reading room,isn't he ?
2) You must kown him,don't you ?
注：当“must+完成体”,并且后有具体的过去时间状语时,附加问句用be或do的过去式,反之,则用have的现在式.
当祈使句为肯定结构时,附加问句常用will you,won't you,would you
当祈使句为否定结构时,附加问句只能用will you
Come and see me tomorrow,will you ?
Don't pretend illness,will you ?
当祈使句是let开头的,宾语为us,附加问句用will you
宾语为me,附加问句用will you,won't you,may i
宾语为him,her,them,附加问句用will you,won't you
当陈述句主语是不定代词one时,附加问句主语在正式场合用one,非正式场合用you
One can't be too careful,can one/you ?
（越小心越好,不是么?）
当陈述句主语是动名词,不定式或从句时,用it
当陈述句主语有neither…nor…连接,附加句的主语常用复数代词
Neither you nor I am wrong,are we?
当陈述句部分是并列句,附加问句应与靠近的分句主语和谓语一致
His mother is an engineer,but his father works as a bus driver,doesn't he?