a person in pink pants playing a guitar
A girl is rehearsing for guitar practice.
Not all persons are a girl. Playing a guitar is not necessarily rehearsing.
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & in(x1,x2) & Theme(e1,x4) & Actor(e1,x3) & v_play(e1) & n_guitar(x4) & (x2 = x3) & n_pants(x2) & a_pink(s1) & Theme(s1,x2) & n_person(x1))
exists e1 x1 x2 x3.(for(e1,x2) & n_practice(x2) & of(x2,x3) & n_guitar(x3) & Actor(e1,x1) & v_rehearse(e1) & n_girl(x1))