A young boy sitting on a rock pile.
The boy watches his dog play with a ball.
Just because A young boy sitting on a rock pile does not indicate that The boy watches his dog play with a ball.
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 x1 x2 x3 x4.(n_play(x2) & of(x2,x3) & n_dog(x3) & of(x2,x1) & n_male(x1) & n_boy(x1) & Theme(e1,x2) & Actor(e1,x1) & v_watch(e1) & with(x2,x4) & n_ball(x4))