an ambulance drives on the street.
A man runs on the path.
An ambulance is not the same thing as a man.
exists x1 x2 x3.(n_street(x3) & a_topic(x1) & on(x1,x3) & n_drive(x1) & of(x1,x2) & n_ambulance(x2))
exists e1 x1 x2.(n_path(x2) & on(e1,x2) & Actor(e1,x1) & v_run(e1) & n_man(x1))