Three boys climb on a slide
Three boys play on a slide.
To climb on a slide is a way to play on a slide.
exists x1 x2 x3.(a_topic(x1) & on(x1,x3) & n_slide(x3) & n_climb(x1) & of(x1,x2) & n_boy(x2) & card_eq_3(x1))
exists e1 x1 x2.(on(e1,x2) & n_slide(x2) & Actor(e1,x1) & v_play(e1) & n_boy(x1) & card_eq_3(x1))