A young boy sitting on a rock pile.
The boy gloomily sits on the swing.
The boy is on a rock pile, not the swing.
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & on(e1,x3) & n_pile(x3) & of(x3,x4) & n_rock(x4) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_boy(x1) & a_young(s1) & Theme(s1,x1))
exists e1 s1 x1 x2.(n_swing(x2) & n_boy(x1) & a_gloomily(s1) & Manner(e1,s1) & on(e1,x2) & Actor(e1,x1) & v_sit(e1))