A airline stewardess serving passengers on a plane.
The stewardess is flying the plane
The stewardess who is flying cannot be serving
exists e1 x1 x2 x3 x4 x5.(a_topic(x1) & on(e1,x5) & n_plane(x5) & Theme(e1,x4) & Actor(e1,x3) & v_serve(e1) & n_passenger(x4) & (x1 = x3) & n_stewardess(x1) & of(x1,x2) & n_airline(x2))
exists e1 x1 x2.(n_plane(x2) & n_stewardess(x1) & Theme(e1,x2) & Actor(e1,x1) & v_fly(e1))