The boy is playing in the sand.
There is a boy playing outside.
The sand is outside.
exists e1 x1 x2.(n_sand(x2) & n_boy(x1) & in(e1,x2) & Actor(e1,x1) & v_play(e1))
exists p1 x1 e1 x2 x3 x4.((x1 = x2) & Theme(e1,x4) & Actor(e1,x3) & v_play(e1) & n_outside(x4) & (x2 = x3) & n_boy(x2))