Some of the trees on the side of the track are beginning to change color with the season.
There are plants outdoors that sense the seasonal change
Some of the trees are plants.
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 p1 s1 x1 x5.(n_change(x5) & a_seasonal(s1) & Theme(s1,x5) & exists e1 x2 x3 x4.((x1 = x2) & Theme(e1,x5) & Actor(e1,x4) & v_sense(e1) & (x2 = x4) & Time(x2,x3) & n_outdoors(x3) & n_plant(x2)))