句型转换 1 He was watching TV when his mother came back home from work (watching TV画线 就画线部分提问) 回答:_ _ he _ when his mother came back home from work?2 She does her homework every evening (用 at nine last Saturday 改写) 回答:She _ _ her homework at nine last Saturday 3 They were talking about the new student before the class began (the new student 画线 就画线部分提问) 回答:_ were they _ _ before the class began?