Boys play ball in the dirt.
Boys play a sport.
THEY IS PLAYING A SPORT WITH A BALL.
exists e1 x1 x2 x3.(n_dirt(x3) & in(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_ball(x2) & n_boy(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_sport(x2) & n_boy(x1))