A janitor stands on a moving walkway whilst cleaning in an airport.
a janitor is cleaning the front area of the airport
The front area of an airport does not always necessarily have to have a moving walkway. And moving walkways do not have to be placed in the front area of the airport. They can be put anywhere in the airport. Or the airport can just not have them.
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 s1 x1 x2 x3.(n_airport(x3) & n_area(x2) & a_front(s1) & Theme(s1,x2) & Theme(e1,x2) & Actor(e1,x1) & v_clean(e1) & of(x2,x3) & n_janitor(x1))