People stroll outdoors at the airport.
They are catching a plane to Mars
One cannot be on a stroll and catching a plane simultaneously.
exists e1 x1 x2 x3.(n_airport(x3) & at(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_stroll(e1) & n_outdoors(x2) & n_people(x1))
exists e1 x1 x2 x3.(ne_geo_mars(x3) & n_thing(x1) & to(e1,x3) & Theme(e1,x2) & Actor(e1,x1) & v_catch(e1) & n_plane(x2))