A police officer is monitoring a by stander while guarding a building.
The police officer is a man.
Just because this is a police officer we can not assume it is a man.
exists e2 e1 x1 x2 x3 x4 x5.(while(e1,e2) & Theme(e2,x5) & Actor(e2,x1) & v_guard(e2) & n_building(x5) & by(e1,x4) & n_stander(x4) & Theme(e1,x3) & Actor(e1,x1) & v_monitor(e1) & n_a(x3) & n_officer(x1) & of(x1,x2) & n_police(x2))
exists p1 x1 x2.(n_officer(x1) & of(x1,x2) & n_police(x2) & exists x3.((x1 = x3) & n_man(x3)))