A police officer is monitoring a by stander while guarding a building.
One person is watching someone else.
if you are monitoring a by stander then you are watching somebody else
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 e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_watch(e1) & r_else(x2) & n_person(x2) & n_person(x1) & card_eq_1(x1))