A dog is running in the snow
It has snowed.
The fact that there is snow implies it has snowed.
exists e1 x1 x2.(n_snow(x2) & in(e1,x2) & Actor(e1,x1) & v_run(e1) & n_dog(x1))
exists e1 x1.(n_thing(x1) & Actor(e1,x1) & v_snow(e1))