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.