用am, is, are 填空 (提示:am 只能用于I后;is 用于第三人称单数之后;are 用于 you 及第一、三人称复数后。) 1. I am a boy. Are you a boy? No, I am not. 2. The girl is Jack's sister 3. The dog is tall and fat. 4. The man with big eyes is a teacher. 5. is your brother in the classroom? 6. Where is your mother? She is at home. 7. How is your father? 8. Mike and Liu Tao are at school. 9. Whose dress is this? 10. Whose socks are they?