The two girls are chatting with each other, aren't they?- Yes,they are.
The guests put on colorful paper hats at the beginning of the party, don't they?-No, they don't.
There aren't any buiscuits on the table, are there?-No,there are not.
The grey cat has gone to the house, hasn't it?- Yes,it has.
The children didn't enjoy the birthday party, did they?-No,they didn't.