A dog is jumping in some sand.
A dog jumps.
dog is jumping is same as dog jumps
exists e1 x1 x2.(in(e1,x2) & n_sand(x2) & Actor(e1,x1) & v_jump(e1) & n_dog(x1))
exists x1 x2.(a_topic(x1) & n_jump(x1) & of(x1,x2) & n_dog(x2))