sentence: You have been having classes since you were nine years old and you already know how to play piano , so I think that you should continue doing sports , because it is important for your health and in your free times you could still play piano without going to classes .
modified: You have classes since you were nine years old and you already know how to play piano , so I think that you should continue doing sports because it is important for your health and in your free times you could still play piano without going to the classes .
transformation: VERB, PUNCT, DET