a skateboarder doing a trick on a ramp
A skateboarder rides his skateboard.
Doing a trick on implies riding a skateboard.
exists e1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_do(e1) & on(x3,x4) & n_ramp(x4) & n_trick(x3) & (x1 = x2) & n_skateboarder(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_skateboard(x2) & of(x2,x1) & n_male(x1) & n_skateboarder(x1))