A light brown dog is chasing after a ball.
The dogs owner is playing catch with him.
A dog can chase a ball without playing catch.
exists e1 s1 s2 x1 x2.(after(e1,x2) & n_ball(x2) & Actor(e1,x1) & v_chase(e1) & n_dog(x1) & a_brown(s2) & Theme(s2,x1) & a_light(s1) & Theme(s1,x1))
exists e1 x1 x2 x3.(n_male(x1) & n_owner(x1) & of(x1,x2) & n_dog(x2) & with(e1,x1) & Theme(e1,x3) & Actor(e1,x1) & v_play(e1) & n_catch(x3))