The twins can swim very well, can't they?
you come to see Jay Chou's concerts, don't you?
The ice isn't thick enough in the river, is it?
The children had a wonderful Christmas party last night, didn't they?
The Hands have never been to Hawaii before, haven't they?
后面三句自由发挥的:
It is very hot today, isn't it?
You have a nice day, don't you?
You won't be late, will you?