Teenagers are looking out the window of a bus.
Teenagers are looking out the window.
You can look out the window and the window can  be a bus window.
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 e1 x1 x2.(n_window(x2) & out(e1,x2) & Actor(e1,x1) & v_look(e1) & n_teenager(x1))