A man is standing on a ladder in front of a cross, while a person is holding the ladder.
A man is standing on a ladder in front of a cross is putting Chiristmas lights on it.
The fact that a man is standing on a ladder in front of a cross, while a person is holding the ladder doesn't imply that the man is putting Chiristmas lights on it.
exists e1 p1 x1 x2 x3 x4.(exists e2 x5.(Theme(e2,x2) & Actor(e2,x5) & v_hold(e2) & n_person(x5)) & n_ladder(x2) & n_ladder(x2) & while(e1,p1) & in(e1,x3) & of(x3,x4) & n_cross(x4) & n_front(x3) & on(e1,x2) & Actor(e1,x1) & v_stand(e1) & n_man(x1))
exists e2 e1 x1 x2 x3 x4 x5 x6 x7.(on(e2,x1) & n_thing(x1) & Theme(e2,x6) & Actor(e2,x1) & v_put(e2) & n_light(x6) & (x6 = x7) & ne_nam_chiristmas(x7) & in(e1,x4) & of(x4,x5) & n_cross(x5) & n_front(x4) & on(e1,x3) & n_ladder(x3) & Actor(e1,x2) & v_stand(e1) & (x1 = x2) & n_man(x1))