People waiting to get on a train.
A group of people are on a plane.
the people are either getting on a train or a plane.
exists e1 p1 x1 x2.(a_topic(x1) & Topic(e1,p1) & Actor(e1,x2) & v_wait(e1) & exists e2 x3.(on(e2,x3) & n_train(x3) & Actor(e2,x2) & v_get(e2)) & (x1 = x2) & n_people(x1))
exists p1 x1 x2.(exists x3.(on(x1,x3) & n_plane(x3)) & of(x1,x2) & n_people(x2) & n_group(x1))