answer: Peter doesn't want to learn to play the piano and promises his mother to study English hard.
documents: #Person1#: Peter, do you want to learn to play the piano?
  #Person2#: No, mom. Piano is for girls.
  #Person1#: Well, there are many boys that can play the piano very well, like Jay Chou.
  #Person2#: No way, mom. I don't like piano.
  #Person1#: OK. But you have to promise me that you will study hard in your English class.
  #Person2#: All right, all right. I understand.