2.  Aff irmative form: She is playing the piano./ They are playing the piano.  Int errogative form: Is she playing the piano? / are they playing the piano?  Negative form: she isn´t (is not) playing the piano. / They aren´t playing the piano.

3.  Aff irmative form: She play S the piano./ They play the piano.  Int errogative form: Does she play the piano? / Do they play the piano?  Negative form: she doesn´t play the piano. / They don´t play the piano.

4.  Aff irmative form: She has played the piano./ They have played the piano.  Int errogative form: Has she played the piano? / Have they played the piano?  Negative form: She hasn´t played the piano. / They haven´t played the piano.

5.  Aff irmative form: She has been playing the piano./ They have been playing the piano.  Int errogative form: Has she been playing the piano? / Have they been playing the piano?  Negative form: She hasn´t been playing the piano. / They haven´t been playing the piano.