句型转换。
1. This is his brother. (改为复数句子)
______ are their______ .
2. That girl is my sister. (改为一般疑问句)
______ that girl______ sister?
3. Those are my friends. (改为单数句子)
______ ______ my______.
4. They are English books. (改为单数句子)
______ is______ English______.
5. She is my grandmother. (改为否定旬)
She______ my grandmother.
