A policewoman directs traffic.
A crossing guard is directing traffic.
A policewoman is usually not a crossing guard.
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_direct(e1) & n_traffic(x2) & n_policewoman(x1))
exists e1 e2 x1 x2.(Theme(e2,x2) & Actor(e2,x1) & v_direct(e2) & n_traffic(x2) & n_guard(x1) & Actor(e1,x1) & v_cross(e1))