People are talking while standing by a row of motorbikes.
People riding their motorbikes in a parade.
People cannot be riding their bikes while standing.
exists e1 e2 x1 x2 x3.(while(e1,e2) & by(e2,x2) & of(x2,x3) & n_motorbike(x3) & n_row(x2) & Actor(e2,x1) & v_stand(e2) & Actor(e1,x1) & v_talk(e1) & n_people(x1))
exists e1 x1 x2 x3 x4.(a_topic(x1) & in(e1,x4) & n_parade(x4) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & n_motorbike(x3) & of(x3,x1) & n_thing(x1) & (x1 = x2) & n_people(x1))