Teenagers are looking out the window of a bus.
Teenagers at the window.
You have to be at the window in order to look out.
exists e1 x1 x2 x3.(n_window(x2) & out(e1,x2) & of(x2,x3) & n_bus(x3) & Actor(e1,x1) & v_look(e1) & n_teenager(x1))
exists x1 x2.(n_window(x2) & a_topic(x1) & at(x1,x2) & n_teenager(x1))