A dog chews on a stick.
An animal chewing
dog chews is same as animal chewing
exists e1 x1 x2.(on(e1,x2) & n_stick(x2) & Actor(e1,x1) & v_chew(e1) & n_dog(x1))
exists x1 x2.(a_topic(x1) & n_chewing(x1) & of(x1,x2) & n_animal(x2))