A dog jumps in the snow.
A dog is laying in the grass.
The snow isn't grass.
exists e1 x1 x2.(n_snow(x2) & in(e1,x2) & Actor(e1,x1) & v_jump(e1) & n_dog(x1))
exists e1 x1 x2.(n_grass(x2) & in(e1,x2) & Actor(e1,x1) & v_lay(e1) & n_dog(x1))