句型转换。 1. This is my sister's room. (改为否定句) This ________ ________ my sister's room. 2. There are some apples on the tree. (改为一般疑问句) ________ there ________ apples on the tree? 3. Those are some English books. (改为单数形式) ________ English ________. 4. They are my parents. (改为同义句) They are my ________ and ________. 5. Her hat is behind the chair . (对画线部分提问) ________ ________ her hat?