The dog is sitting on the side of the hill.
The dog runs down the hillside.
In one instance the dog is sitting, in the other instance the dog runs.
exists e1 x1 x2 x3.(n_hill(x3) & n_side(x2) & n_dog(x1) & on(e1,x2) & of(x2,x3) & Actor(e1,x1) & v_sit(e1))
exists e1 x1 x2.(n_hillside(x2) & n_dog(x1) & down(e1,x2) & Actor(e1,x1) & v_run(e1))