Are you going to visit the History Museum?
Yes,we are.No,we are not.
Did your two brothes go fishing one day?
Yes,they did.No,they didn't.
Are the twins climbing the tree now?
Yes,they are.No,they aren't.
Does he have a lovely dog?
Yes,he does.No,he doesn't.
Is there any ink in the bottle?
Yes,there is.No,there isn't.