A boy runs through the sand.
A boy running on the beach.
Not all sand is on a beach.
exists e1 x1 x2.(n_sand(x2) & through(e1,x2) & Actor(e1,x1) & v_run(e1) & n_boy(x1))
exists e1 x1 x2 x3.(n_beach(x3) & a_topic(x1) & on(e1,x3) & Actor(e1,x2) & v_run(e1) & (x1 = x2) & n_boy(x1))