A boy is doing a stunt with his skateboard.
The boy knows how to perform a trick with his skateboard.
A boy know how to perform a stunt  with this skateboard
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 x5.(n_skateboard(x5) & of(x5,x1) & n_male(x1) & n_boy(x1) & Topic(e1,x2) & Actor(e1,x1) & v_know(e1) & n_manner(x2) & exists e2 x3 x4.(with(e2,x5) & Theme(e2,x4) & Actor(e2,x3) & v_perform(e2) & n_trick(x4)))