A policeman stands outside the door to a shop.
a policeman is on the clock.
It is possible for a policeman to stand outside a shop and yet not be on the clock.
exists e1 x1 x2 x3.(n_door(x2) & outside(e1,x2) & to(x2,x3) & n_shop(x3) & Actor(e1,x1) & v_stand(e1) & n_policeman(x1))
exists p1 x1 x2.(n_clock(x2) & on(x1,x2) & n_policeman(x1))