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. |