A man performs a wakeboarding trick
A man riding a wakeboard.
People who performs a wakeboarding trick then then are riding a wakeboard
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_perform(e1) & n_trick(x2) & of(x2,x3) & n_wakeboarding(x3) & n_man(x1))
exists e1 x1 x2 x3.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_ride(e1) & n_wakeboard(x3) & (x1 = x2) & n_man(x1))