17) 省去主语的祈使句的反意疑问句，疑问部分用will you。

Don't do that again, will you?

Go with me, will you / won't you ?

注意： Let's 开头的祈使句，后用shall we?

Let us 开头的祈使句，后用will you?

Let's go and listen to the music, shall we?

Let us wait for you in the reading-room, will you ?

18)陈述部分是"there be"结构的，疑问部分用there省略主语代词。

There is something wrong with your watch, isn't there?

There will not be any trouble, will there?

19)否定前缀不能视为否定词，其反意疑问句仍用否定形式。

It is impossible, isn't it?

He is not unkind to his classmates, is he?

20)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?