A person walking by a window with the drapes closed.
No light can come through the drapes on the window.
Since drapes are not always opaque, they don't guarantee that no light can come through.
exists e1 x1 x2 x3 x4.(n_drape(x4) & Actor(e1,x1) & v_close(e1) & by(x1,x3) & with(x3,x4) & n_window(x3) & Time(x1,x2) & n_walking(x2) & n_person(x1))
exists x2 x3.(n_window(x3) & n_drape(x2) & -exists e1 p1 x1.(exists e2.(through(e2,x2) & on(x2,x3) & Actor(e2,x1) & v_come(e2)) & Topic(e1,p1) & Actor(e1,x1) & v_can(e1) & n_light(x1)))