One man doing skateboarding stunts.
A man is riding a skateboard
skateboarding stunts can be done only while riding a skateboard.
exists e1 e2 x1 x2 x3.(a_topic(x1) & Theme(e2,x3) & Actor(e2,x2) & v_do(e2) & n_stunt(x3) & Actor(e1,x3) & v_skateboard(e1) & (x1 = x2) & n_man(x1) & card_eq_1(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_skateboard(x2) & n_man(x1))