A teenage couple taking walk in fall.
The old men laugh.
A teenage couple is younger than a couple of old men. Walking is a different action than laughing.
exists e1 x1 x2 x3 x4 x5.(a_topic(x1) & in(e1,x5) & n_fall(x5) & Theme(e1,x4) & Actor(e1,x3) & v_take(e1) & n_walk(x4) & (x1 = x3) & n_couple(x1) & of(x1,x2) & n_teenage(x2))
exists s1 x1 x2.(n_laugh(x1) & of(x1,x2) & n_man(x2) & a_old(s1) & Theme(s1,x1) & a_topic(x1))