Young male nose sliding a skateboard down a 3-step rail.
A boy is riding on a skateboard.
Sliding on a skateboard indicates riding on a skateboard.
exists e1 s1 s2 x1 x2 x3 x4 x5.(a_topic(x1) & down(e1,x5) & n_rail(x5) & a_3-step(s2) & Theme(s2,x5) & Theme(e1,x4) & Actor(e1,x3) & v_slide(e1) & n_skateboard(x4) & (x1 = x3) & n_nose(x1) & of(x1,x2) & n_male(x2) & a_young(s1) & Theme(s1,x1))
exists e1 x1 x2.(on(e1,x2) & n_skateboard(x2) & Actor(e1,x1) & v_ride(e1) & n_boy(x1))