People walk through a square.
People sitting on their couch.
The people can't be sitting while they walk.
exists e1 x1 x2.(through(e1,x2) & n_square(x2) & Actor(e1,x1) & v_walk(e1) & n_people(x1))
exists e1 x1 x2 x3.(a_topic(x1) & on(e1,x3) & n_couch(x3) & of(x3,x1) & n_thing(x1) & Actor(e1,x2) & v_sit(e1) & (x1 = x2) & n_people(x1))