Girl running next to a pool.
Nobody is running
If nobody is running then the girl could not be running it can be one or the other.
exists e1 x1 x2.(ne_nam_girl(x1) & to(e1,x2) & n_pool(x2) & r_next(e1) & Actor(e1,x1) & v_run(e1))
-exists e1 x1.(Actor(e1,x1) & v_run(e1) & n_person(x1))