A black dog runs on the beach.
The dog is running off the leash.
Just because a dog is running does not mean he is off the leash while doing so.
exists e1 s1 x1 x2.(n_beach(x2) & on(e1,x2) & Actor(e1,x1) & v_run(e1) & n_dog(x1) & a_black(s1) & Theme(s1,x1))
exists e1 s1 x1 x2.(n_leash(x2) & n_dog(x1) & a_off(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_run(e1))