A dog chases a Nerf ball in the grass.
The dog fetches the ball for its owner
Just because the dog chases the ball, does not imply the dog fetches the ball.
exists e1 x1 x2 x3 x4.(n_grass(x4) & in(e1,x4) & Theme(e1,x2) & Actor(e1,x1) & v_chase(e1) & n_ball(x2) & (x2 = x3) & ne_org_nerf(x3) & n_dog(x1))
exists e1 x1 x2 x3.(n_owner(x3) & of(x3,x2) & n_thing(x2) & n_ball(x2) & n_dog(x1) & Theme(e1,x2) & Actor(e1,x1) & v_fetch(e1) & for(x2,x3))