A janitor stands on a moving walkway whilst cleaning in an airport.
a janitor stands near an airport
The can't stand near the airport if he is moving on a walkway.
exists e2 e1 x1 x2 x3 x4 x5.(on(e1,x2) & in(x2,x5) & n_airport(x5) & n_cleaning(x2) & of(x2,x4) & n_whilst(x4) & of(x2,x3) & n_walkway(x3) & Actor(e2,x2) & v_move(e2) & Actor(e1,x1) & v_stand(e1) & n_janitor(x1))
exists e1 x1 x2.(near(e1,x2) & n_airport(x2) & Actor(e1,x1) & v_stand(e1) & n_janitor(x1))