Some of the trees on the side of the track are beginning to change color with the season.
Fall is causing the leaves to change.
It is not known if Fall is causing the leaves to change.
exists e1 p1 x1 x2 x3 x4 x6.(n_season(x6) & n_track(x4) & n_side(x3) & n_tree(x2) & Topic(e1,p1) & Actor(e1,x1) & v_begin(e1) & exists e2 x5.(with(e2,x6) & Theme(e2,x5) & Actor(e2,x1) & v_change(e2) & n_color(x5)) & of(x1,x2) & on(x2,x3) & of(x3,x4) & n_thing(x1))
exists e1 p1 x1 x2.(n_leaf(x2) & ne_nam_fall(x1) & Topic(e1,p1) & Recipient(e1,x2) & Actor(e1,x1) & v_cause(e1) & exists e2.(Actor(e2,x2) & v_change(e2)))