句型转换。
1. He used to go swimming in this river. (改为一般疑问句)
_____ he _____ to go swimming in this river?
2. He used to be afraid of the dark. (对画线部分提问)
_____ _____ he _____ to be afraid of?
3. I have to study for the test. (对画线部分提问)
_____ _____ you have to _____ for?
4. My biggest problem is that I'm too busy. (对画线部分提问)
_____ _____ your biggest problem?
5. Tian Jun used to play football. (改为否定句)
Tian Jun _____ _____ to play football.
