A child slides down an orange slide.
An orange slide has a child on it.
If a child slides down an orange slide, it follows that the slide has a child on it.
exists e1 s1 x1 x2 x3.(a_down(s1) & Manner(e1,s1) & Theme(e1,x2) & Actor(e1,x1) & v_slide(e1) & n_slide(x2) & of(x2,x3) & n_orange(x3) & n_child(x1))
exists e1 x1 x2 x3.(on(e1,x1) & n_thing(x1) & Theme(e1,x3) & Actor(e1,x1) & v_have(e1) & n_child(x3) & n_slide(x1) & of(x1,x2) & n_orange(x2))