A man is cleaning the walkway at an airport.
A man is cleaning at an airport.
Cleaning at an airport is a rephrasing of cleaning the walkway at an airport.
exists e1 x1 x2 x3.(n_walkway(x2) & Theme(e1,x2) & Actor(e1,x1) & v_clean(e1) & at(x2,x3) & n_airport(x3) & n_man(x1))
exists e1 x1 x2.(at(e1,x2) & n_airport(x2) & Actor(e1,x1) & v_clean(e1) & n_man(x1))