A boy speeding down a steep slide.
A boy is on playground equipment
The boy is on playground equipment because he is speeding down slide.
exists e1 s1 s2 x1 x2 x3.(a_topic(x1) & a_down(s2) & Manner(e1,s2) & Theme(e1,x3) & Actor(e1,x2) & v_speed(e1) & n_slide(x3) & a_steep(s1) & Theme(s1,x3) & (x1 = x2) & n_boy(x1))
exists p1 x1.(exists x2 x3.(on(x1,x2) & n_equipment(x2) & of(x2,x3) & n_playground(x3)) & n_boy(x1))