A dog plays on the beach.
A cat drinking from a toilet.
A dog plays as opposed to a cat drinks.
exists e1 x1 x2.(n_beach(x2) & on(e1,x2) & Actor(e1,x1) & v_play(e1) & n_dog(x1))
exists x1 x2 x3.(a_topic(x1) & from(x1,x3) & n_toilet(x3) & n_drinking(x1) & of(x1,x2) & n_cat(x2))