A dog plays on the beach.
A dog plays by water.
Playing by water does not imply the dog is on the beach.
exists e1 x1 x2.(n_beach(x2) & on(e1,x2) & Actor(e1,x1) & v_play(e1) & n_dog(x1))
exists e1 x1 x2.(by(e1,x2) & n_water(x2) & Actor(e1,x1) & v_play(e1) & n_dog(x1))