句型转换。 1. That is my good pen friend. (改为复数句子) _____ _____ our good pen _____ . 2. This is her family photo. (变为一般疑问句) _____ _____ her _____ photo? 3. Tom is Mr Green's son. (改为同义句) Mr Green is _____ _____ . 4. Those are my friends. (对划线部分提问) _____ _____ those? 5. They are orange backpacks. (改为单数句子) _____ _____ orange backpack.