句型转换。
1. The boys used to go fishing by the river. (改为一般疑问句)
    _____ the boys _____ to go fishing by the river?
2. There isn't anything wrong with your son. (同义句转换)
    There _____ _____ wrong with your son.
3. He is old enough. He can go to school. (合并为一句)
    He is old _____ _____ go to school.
4. Kate was learning English at 9 o'clock last Sunday morning. (对画线部分提问)
    _____ was Kate _____ at 9 o'clock last Sunday morning?
5. How about going with me? (同义句转换)
    _____ _____ go with me?