用am，is或are填空。
1.That's my father and this my mother.
They my parents.
2.This is my friend and that my sister.
3. —_ she your sister?
—Yes.she .
4.— he your brother?
—No. He my friend.
5.— Guo Peng your brother?
—Yes, he .
6. I his friend and he my friend.
7. — you Jack's brother?
—No, I'm not.
8.These my parents and those my grandparents.
