A teenager boy does a trick with his skateboard against a wall.
A teen doing a skateboard trick.
A teenager is a teen, and skateboard trick is a rephrasing of trick with his skateboard.
exists e1 x1 x2 x3 x4 x5.(with(e1,x4) & against(x4,x5) & n_wall(x5) & n_skateboard(x4) & of(x4,x1) & n_male(x1) & Theme(e1,x3) & Actor(e1,x1) & v_do(e1) & n_trick(x3) & n_boy(x1) & of(x1,x2) & n_teenager(x2))
exists e1 x1 x2 x3 x4.(a_topic(x1) & Theme(e1,x3) & Actor(e1,x2) & v_do(e1) & n_trick(x3) & of(x3,x4) & n_skateboard(x4) & (x1 = x2) & n_teen(x1))