A motorcycle policeman observes the crosswalks in the middle of a city.
Someone is watching a crosswalk.
A motorcycle policeman is someone and observes is same as watching.
exists e1 x1 x2 x3 x4 x5.(n_middle(x4) & n_crosswalk(x3) & in(e1,x4) & of(x4,x5) & n_city(x5) & Theme(e1,x3) & Actor(e1,x1) & v_observe(e1) & n_policeman(x1) & of(x1,x2) & n_motorcycle(x2))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_watch(e1) & n_crosswalk(x2) & n_person(x1))