A gray dog plays in the sand at the ocean.
A dog is taking a nap on the beach.
One cannot be playing and taking a nap simultaneously
exists s1 x1 x2 x3 x4.(n_ocean(x4) & n_sand(x3) & a_topic(x1) & in(x1,x3) & at(x3,x4) & n_play(x1) & of(x1,x2) & n_dog(x2) & a_gray(s1) & Theme(s1,x1))
exists e1 x1 x2 x3.(n_beach(x3) & on(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_take(e1) & n_nap(x2) & n_dog(x1))