A dog is running in the snow
A dog is running in a blizzard.
Just because it is snowing it doesn't mean that it is a blizzard.
exists e1 x1 x2.(n_snow(x2) & in(e1,x2) & Actor(e1,x1) & v_run(e1) & n_dog(x1))
exists e1 x1 x2.(in(e1,x2) & n_blizzard(x2) & Actor(e1,x1) & v_run(e1) & n_dog(x1))