句型转换。 1. I used to be afraid of flying in an airplane. (改为同义句) I used to be afraid ___________ in an airplane. 2. I don't know how I can swim well. (改为简单句) I don't know ___________ well. 3. It seems that he has passed the exam. (改为简单句) He __________ passed the exam. 4. I used to have long hair. (改为同义句) I ___________ have long hair ___________. 5. You used to play the piano, ___________? (完成反意疑问句)