A boy is doing a trick on his skateboard in a park.
A boy is riding a skateboard
the boy is riding his skateboard while doing a trick.
exists e1 x1 x2 x3 x4.(in(e1,x4) & n_park(x4) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & on(x2,x3) & n_skateboard(x3) & of(x3,x1) & n_male(x1) & n_trick(x2) & n_boy(x1))
exists e1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_ride(e1) & n_skateboard(x2) & n_boy(x1))