A man running on a track.
The man is running on a school track.
The track is not necessarily a school track.
exists e1 x1 x2 x3.(a_topic(x1) & on(e1,x3) & n_track(x3) & Actor(e1,x2) & v_run(e1) & (x1 = x2) & n_man(x1))
exists e1 x1 x2 x3.(n_man(x1) & on(e1,x2) & n_track(x2) & of(x2,x3) & n_school(x3) & Actor(e1,x1) & v_run(e1))