An adult and a child sitting on a police motorcycle.
Two people sitting on a motorcycle with a police officer watching nearby
just because an adult and a child sitting are on a police motorcycle doesn't imply a police officer watching nearby
exists e1 s1 x1 x2 x3 x4 x5.(a_topic(s1) & subset_of(x2,s1) & on(e1,x4) & n_motorcycle(x4) & of(x4,x5) & n_police(x5) & Actor(e1,x3) & v_sit(e1) & (x2 = x3) & n_child(x2) & subset_of(x1,s1) & n_adult(x1))
exists e1 e2 s1 x1 x2 x3 x4 x5 x6.(a_topic(x1) & with(e1,x4) & a_nearby(s1) & Manner(e2,s1) & Actor(e2,x6) & v_watch(e2) & (x4 = x6) & n_officer(x4) & of(x4,x5) & n_police(x5) & on(e1,x3) & n_motorcycle(x3) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_people(x1) & card_eq_2(x1))