People are talking while standing by a row of motorbikes.
People next to motorbikes
Standing by motorbikes imply people are next to motorbikes.
exists e2 e1 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 s1 x1 x2 x3.(a_topic(x1) & to(s1,x3) & n_motorbike(x3) & Theme(s1,x2) & a_next(s1) & (x1 = x2) & n_people(x1))