Police officers on horses stop by a group of boys.
There were police officers patrolling and stopped by a group of people.
Police officers on horses implies the police officers were patrolling.
exists x1 x2 x3 x4 x5 x6.(a_topic(x1) & on(x1,x3) & by(x3,x5) & of(x5,x6) & n_boy(x6) & n_group(x5) & n_stop(x3) & of(x3,x4) & n_horse(x4) & n_officer(x1) & of(x1,x2) & n_police(x2))
exists p1 x1 e2 e1 x2 x3 x4 x5 x6 x7 x8 x9.((x1 = x5) & Actor(e2,x8) & of(x8,x9) & n_people(x9) & n_group(x8) & Theme(e2,x7) & v_stop(e2) & (x5 = x7) & n_officer(x5) & of(x5,x6) & n_police(x6) & (x1 = x2) & Actor(e1,x4) & v_patrol(e1) & (x2 = x4) & n_officer(x2) & of(x2,x3) & n_police(x3))