A person standing a rocky ridge.
A person is sleeping.
A person standign can't be sleeping.
exists e1 s1 x1 x2 x3.(a_topic(x1) & n_ridge(x3) & a_rocky(s1) & Theme(s1,x3) & Time(e1,x3) & Actor(e1,x2) & v_stand(e1) & (x1 = x2) & n_person(x1))
exists e1 x1.(Actor(e1,x1) & v_sleep(e1) & n_person(x1))