A dog and a ball.
A dog is chasing a ball.
Although there is a dog and ball it does not imply the dog is chasing the ball.
exists s1 x1 x2.(a_topic(s1) & subset_of(x2,s1) & n_ball(x2) & subset_of(x1,s1) & n_dog(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_chase(e1) & n_ball(x2) & n_dog(x1))