A family is sledding in the snow.
A dog is sledding in the snow.
A family is different then a dog
exists e1 x1 x2.(n_snow(x2) & in(e1,x2) & Actor(e1,x1) & v_sled(e1) & n_family(x1))
exists e1 x1 x2.(n_snow(x2) & in(e1,x2) & Actor(e1,x1) & v_sled(e1) & n_dog(x1))