A dog on snow has something in its mouth.
There is a dog in the grass
dog has got to be either in snow or on grass.
exists e1 x1 x2 x3 x4.(Theme(e1,x3) & Actor(e1,x1) & v_have(e1) & in(x3,x4) & n_mouth(x4) & of(x4,x1) & n_thing(x1) & n_thing(x3) & on(x1,x2) & n_snow(x2) & n_dog(x1))
exists p1 x1 x3.(n_grass(x3) & exists x2.((x1 = x2) & in(x2,x3) & n_dog(x2)))