A boy plays with sand near green grass.
Boy plays in the park
A park isn't the only place with grass.
exists e1 s1 x1 x2 x3.(with(e1,x2) & near(x2,x3) & n_grass(x3) & a_green(s1) & Theme(s1,x3) & n_sand(x2) & Actor(e1,x1) & v_play(e1) & n_boy(x1))
exists e1 x1 x2.(n_park(x2) & ne_nam_boy(x1) & in(e1,x2) & Actor(e1,x1) & v_play(e1))