A dog running on the beach.
A dog is being petted by a stranger.
The dog can not be running and being petted at the same time.
exists e1 x1 x2 x3.(n_beach(x3) & a_topic(x1) & on(e1,x3) & Actor(e1,x2) & v_run(e1) & (x1 = x2) & n_dog(x1))
exists e1 x1 x2.(Actor(e1,x2) & n_stranger(x2) & Theme(e1,x1) & v_pet(e1) & n_dog(x1))