A couple kisses beside train tracks.
There is no one beside the train tracks.
If there is no one beside the train tracks, there cannot be a couple kissing there.
exists e1 x1 x2 x3.(beside(e1,x2) & n_track(x2) & of(x2,x3) & n_train(x3) & Actor(e1,x1) & v_kiss(e1) & n_couple(x1))
exists p1 x1 x2 x3.(n_track(x2) & of(x2,x3) & n_train(x3) & beside(p1,x2) & -exists x4.((x1 = x4) & n_one(x4)))