问：变成否定句：I used to play the piano.

问：变成否定句：I used to play the piano. He used to play the piano.变为否定句 Let's play the piano.(变成否定句） I used to play the piano after school.(play the piano是对画线部分提 I can play the guitar and the piano否定句 I have to play the piano every evening.改为否定句 I think they are going to play the piano（改为否定句） "I play the piano very well"怎么变为否定句? He is going to play the piano.改为否定句 Used he to play the piano?回答 I used to play sports in the afternoon.（改为一般否定句） I can play piano.(改为否定句