Several young people walking along a set of train tracks.
Several people are walking along some train tracks.
both sentences have people walking along train tracks.
exists e1 s1 s2 x1 x2 x3 x4 x5.(a_topic(x1) & along(e1,x3) & of(x3,x4) & n_track(x4) & of(x4,x5) & n_train(x5) & n_set(x3) & Actor(e1,x2) & v_walk(e1) & (x1 = x2) & n_people(x1) & a_young(s2) & Theme(s2,x1) & a_several(s1) & Theme(s1,x1))
exists e1 s1 x1 x2 x3.(along(e1,x2) & n_track(x2) & of(x2,x3) & n_train(x3) & Actor(e1,x1) & v_walk(e1) & n_people(x1) & a_several(s1) & Theme(s1,x1))