Police officer patrolling on a bicycle.
Police officer ride a bike.
To ride a bike implies that the officer is on a bicycle.
exists x1 x2 x3 x4.(a_topic(x1) & on(x1,x4) & n_bicycle(x4) & n_patrolling(x1) & of(x1,x3) & n_officer(x3) & (x1 = x2) & ne_nam_police(x2))
all x1.(n_bike(x1) -> exists x2 x3 x4.(a_topic(x2) & for(x2,x1) & n_ride(x2) & of(x2,x4) & n_officer(x4) & (x2 = x3) & ne_nam_police(x3)))