A man in a black ball cap skateboarding down a metal railing.
A man is skateboarding.
If a man is skateboarding down a metal railing he is skateboarding.
exists e1 s1 s2 x1 x2 x3 x4 x5 x6.(a_topic(x1) & in(x1,x2) & a_down(s2) & Manner(e1,s2) & Theme(e1,x5) & Actor(e1,x4) & v_skateboard(e1) & n_railing(x5) & of(x5,x6) & n_metal(x6) & (x2 = x4) & n_cap(x2) & of(x2,x3) & n_ball(x3) & a_black(s1) & Theme(s1,x2) & n_man(x1))
exists e1 x1.(Actor(e1,x1) & v_skateboard(e1) & n_man(x1))