①He might have forgotten his pen in the classroom yesterday, didn't he?

(不用mightn't he?/ hasn't he?)

②You must have got up late this morning, didn't you?(不用mustn't you?/haven't you?)

①He used to live in the country, didn't he?/usedn't he?

②They used to be good friends, didn't they?/usedn't they?

①You'd better tell him about the matter, hadn't you?②We had better do it by ourselves, hadn't we?

①There are two cakes on the plate, aren't there? ②Here is a story about Mark Twain, isn't here?

Don't make any noise, will you?

①Do sit down, won't you?/ will you? ②You feed the bird today, will you?

③Please open the window, will you?(won't you?)

Let's go home together, shall we?

Let us stop to rest, will you?

Let me have a try, shall I?(will you?)

①Someone has taken the seat, hasn't he?②Everyone has done their best in the game, haven't they?