①wish若在陈述部分作谓语，用“May I”反疑
②祈使句后边的反义疑问句，用will you,won't you,would you,can you,can't you,could you.
*won't用于邀请别人，其他是自己要求别人干某事
Sit down please,won't you?
③let's开头祈使句用shall we?(包括双方）
let's meet him,shall we?(征求对方意见）
特例：Let's not invite him,ok(all right)?
④dare用作情态动词，反义本身用作实意，
Mary dare not go out,dare she?
⑤陈述部分用need't构成，后边可用need或must。
⑥ought to 用陈述部分，反义用本身 oughtn't
⑦had better用在陈述部分，反义用hadn't
⑧would rather/sooner/like,用wouldn't
⑨used to放在陈述部分，若用作情态动词用usen't,用作实意动词用didn't
There used to be a chair,wasn't there?
⑩have to 放在陈述部分，反义用do各种形式。
She has to get there on time,doesn't she?
a、must 当“应当，必须”讲时，用mustn't,needn't均可。
b、当must在陈述句中当不准意思表否定时，后用must.
c、当must当猜测时，还原本意在看
He must in his office,isn't he?
They must be talking,aren't they?
He must have seen the film yesterday,didn't he?
The street have been cleaned yesterday,wasn't it?
