A dog walks along a beach.
A dog is walking with his owner on the beach.
We don't know that the dog is walking with his owner.
exists e1 x1 x2.(along(e1,x2) & n_beach(x2) & Actor(e1,x1) & v_walk(e1) & n_dog(x1))
exists e1 x1 x2 x3.(n_beach(x3) & with(e1,x2) & on(x2,x3) & n_owner(x2) & of(x2,x1) & n_male(x1) & Actor(e1,x1) & v_walk(e1) & n_dog(x1))