Teenagers play in shopping carts of a rooftop.
There are teenages on the rooftop.
Teenagers are on the rooftop since teenagers are playing in carts on rooftops.
exists e1 x1 x2 x3 x4.(in(e1,x2) & of(x2,x4) & n_rooftop(x4) & n_cart(x2) & of(x2,x3) & n_shopping(x3) & Actor(e1,x1) & v_play(e1) & n_teenager(x1))
exists p1 x1 x3.(n_rooftop(x3) & exists x2.((x1 = x2) & on(x2,x3) & n_teenage(x2)))