Some of the trees on the side of the track are beginning to change color with the season.
The leaves are changing colors.
Some of the trees are beginning to change color implies The leaves are changing colors.
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 x1 x2.(n_leaf(x1) & Theme(e1,x2) & Actor(e1,x1) & v_change(e1) & n_color(x2))