A dog chews on a stick.
A huge animal chewing
A huge animal could be any animal at all, not necessarily a dog.
exists e1 x1 x2.(on(e1,x2) & n_stick(x2) & Actor(e1,x1) & v_chew(e1) & n_dog(x1))
exists e1 s1 x1 x2.(a_topic(x1) & Actor(e1,x2) & v_chew(e1) & (x1 = x2) & n_animal(x1) & a_huge(s1) & Theme(s1,x1))