A boy jumping a rail on his skateboard.
A boy skateboarding.
While skateboarding a boy is jumping a rail.
exists e1 x1 x2 x3 x4.(a_topic(x1) & on(e1,x4) & n_skateboard(x4) & of(x4,x1) & n_male(x1) & Theme(e1,x3) & Actor(e1,x2) & v_jump(e1) & n_rail(x3) & (x1 = x2) & n_boy(x1))
exists x1 x2.(a_topic(x1) & n_skateboarding(x1) & of(x1,x2) & n_boy(x2))