A police officer on a bike talking to a the person in the yellow tank top.
The people are talking about riding bicycles.
The police are probably not talking about riding bicycles and may not even speak of them the whole day.
exists e1 s1 x1 x2 x3 x4 x5 x6 x7 x8.(n_top(x7) & of(x7,x8) & n_tank(x8) & a_yellow(s1) & Theme(s1,x7) & n_person(x5) & a_topic(x1) & on(x1,x3) & to(e1,x5) & in(x5,x7) & Time(x5,x6) & n_a(x6) & Actor(e1,x4) & v_talk(e1) & (x3 = x4) & n_bike(x3) & n_officer(x1) & of(x1,x2) & n_police(x2))
exists e2 e1 x1 x2 x3.(n_people(x1) & about(e1,e2) & Theme(e2,x3) & Actor(e2,x2) & v_ride(e2) & n_bicycle(x3) & Actor(e1,x1) & v_talk(e1))