1 did she?这是一个带有从句的反义疑问句,跟主句走.但如果主句I/We.think/guess/belive等,反义疑问句则跟从句走,另外,反义疑问句的通则为前否后肯,前肯后否,本题never为否,则后肯.
2 didn't he?此题为否定转移,否定词应含在从句中,反义疑问句跟主句走.主句应推理为he thought,所以用didn't he?
3 didn't she?
4 didn't you?must做“一定”“准是”之意时,表推测时,反义疑问句的助动词要与must后面的动词相呼应.但当有表示过去时间的时间状语修饰时,反义疑问句用didn't.此题中有last night
5 have we?主句中出现否定词nothing,反义疑问句用肯.
6 mayn't we?合乎常理,前肯后否.
7must/may we?mustn't表示“不允许,禁止”之意时,可以用must/may构成反义疑问句.