A dog with a ball in a grassy field.
dog catches the ball
A dog with a ball is not necessarily a dog who catches the ball.
exists s1 x1 x2 x3.(a_topic(x1) & with(x1,x2) & in(x2,x3) & n_field(x3) & a_grassy(s1) & Theme(s1,x3) & n_ball(x2) & n_dog(x1))
exists e1 x1 x2.(n_ball(x2) & Theme(e1,x2) & Actor(e1,x1) & v_catch(e1) & n_dog(x1))