Young boy sliding down a slide.
boy playing with a ball
If a boy is playing with a ball he is not sliding down a slide.
exists e1 s1 s2 x1 x2 x3.(a_topic(x1) & a_down(s2) & Manner(e1,s2) & Theme(e1,x3) & Actor(e1,x2) & v_slide(e1) & n_slide(x3) & (x1 = x2) & n_boy(x1) & a_young(s1) & Theme(s1,x1))
exists x1 x2 x3.(a_topic(x1) & with(x1,x3) & n_ball(x3) & n_playing(x1) & of(x1,x2) & n_boy(x2))