People standing in line in a crowded place.
People are waiting in line for concert tickets.
People standing in line in a crowded may or may not be waiting for concert tickets.
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & in(e1,x4) & n_place(x4) & a_crowded(s1) & Theme(s1,x4) & in(e1,x3) & n_line(x3) & Actor(e1,x2) & v_stand(e1) & (x1 = x2) & n_people(x1))
exists e1 x1 x2 x3 x4.(in(e1,x2) & for(x2,x3) & n_ticket(x3) & of(x3,x4) & n_concert(x4) & n_line(x2) & Actor(e1,x1) & v_wait(e1) & n_people(x1))