A boy is playing in the ocean waves.
A boy is at the beach.
A boy playing in the ocean waves means he is at the beach as beach encompasses ocean waves surroundings.
exists e1 x1 x2 x3.(n_wave(x2) & of(x2,x3) & n_ocean(x3) & in(e1,x2) & Actor(e1,x1) & v_play(e1) & n_boy(x1))
exists p1 x1 x2.(n_beach(x2) & at(x1,x2) & n_boy(x1))