A dog digging for his ball in the sand.
The ball is hidden in the sand.
A dog digging for his ball in the sand does not imply the ball is hidden in the sand necessarily.
exists e1 x1 x2 x3 x4.(n_sand(x4) & a_topic(x1) & for(e1,x3) & in(x3,x4) & n_ball(x3) & of(x3,x1) & n_male(x1) & Actor(e1,x2) & v_dig(e1) & (x1 = x2) & n_dog(x1))
exists e1 x1 x2.(n_sand(x2) & n_ball(x1) & in(e1,x2) & Theme(e1,x1) & v_hide(e1))