A boy is doing a stunt with his skateboard.
A boy is doing tricks at a skate park.
The boy may not be at a skate park
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & with(x2,x3) & n_skateboard(x3) & of(x3,x1) & n_male(x1) & n_stunt(x2) & n_boy(x1))
exists e1 x1 x2 x3 x4.(at(e1,x3) & n_park(x3) & of(x3,x4) & n_skate(x4) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & n_trick(x2) & n_boy(x1))