Dog digs in sand
The dog is hiding its treasure.
Dog digging in sand is not necessarily hiding its treasure.
exists e1 x1 x2.(ne_nam_dog(x1) & in(e1,x2) & n_sand(x2) & Actor(e1,x1) & v_dig(e1))
exists e1 x1 x2.(n_treasure(x2) & of(x2,x1) & n_thing(x1) & n_dog(x1) & Theme(e1,x2) & Actor(e1,x1) & v_hide(e1))