a young man sliiding down a railing near some stairs
The young man is sliding down the rails on a skateboard.
Sliding down stairs can be done without being on a skateboard.
exists e1 s1 s2 x1 x2 x3 x4.(a_topic(x1) & a_down(s2) & Manner(e1,s2) & Theme(e1,x3) & Actor(e1,x2) & v_sliid(e1) & near(x3,x4) & n_stair(x4) & n_railing(x3) & (x1 = x2) & n_man(x1) & a_young(s1) & Theme(s1,x1))
exists e1 s1 s2 x1 x2 x3.(n_rail(x2) & n_man(x1) & a_young(s1) & Theme(s1,x1) & on(e1,x3) & n_skateboard(x3) & a_down(s2) & Manner(e1,s2) & Theme(e1,x2) & Actor(e1,x1) & v_slide(e1))