A girl playing her guitar in her bedroom.
A girl is practicing playing the guitar.
Saying someone is playing guitar is the same as saying she is practicing playing her guitar.
exists e1 x1 x2 x3 x4.(a_topic(x1) & in(e1,x4) & n_bedroom(x4) & of(x4,x1) & n_female(x1) & n_female(x1) & Theme(e1,x3) & Actor(e1,x2) & v_play(e1) & n_guitar(x3) & of(x3,x1) & (x1 = x2) & n_girl(x1))
exists e1 p1 x1 x2.(n_guitar(x2) & exists e2.(Theme(e2,x2) & Actor(e2,x1) & v_play(e2)) & Topic(e1,p1) & Actor(e1,x1) & v_practice(e1) & n_girl(x1))