很基础的be动词、助动词、时态基础练习，针对基础差的学生用来课外补习基础知识。
Be动词用法练习
一、用am, is, are 填空
1. I ______ a boy. ______ you a boy? No, I _____ not.
2. The girl______ Jack's sister.
3. The dog _______ tall and fat.
4. The man with big eyes _______ a teacher.
5. ______ your brother in the classroom?
6. Where _____ your mother? She ______ at home.
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