A dog walks on the beach.
A dog is on the beach.
dog walks on the beach means dog on the beach.
exists e1 x1 x2.(n_beach(x2) & on(e1,x2) & Actor(e1,x1) & v_walk(e1) & n_dog(x1))
exists p1 x1 x2.(n_beach(x2) & on(x1,x2) & n_dog(x1))