1、Are these your pen? Yes, they are./No, they aren't.
2、Is this your mother? Yes, it is./No, it isn't.
3、Is he your father? Yes, he is./No, he isn't.
4、Are those cow? Yes, they are./No, they aren't.
5、Are they play computer? Yes, they are./ No, they aren't.
6、Is that her case? Yes, it is. No, it isn't.