A man in a green shirt is doing a trick on a skateboard.
The man is practicing for a skateboard championship.
Not every man doing a trick on a skateboard is practicing for a skateboard championship.
exists e1 s1 x1 x2 x3 x4.(Theme(e1,x3) & Actor(e1,x1) & v_do(e1) & on(x3,x4) & n_skateboard(x4) & n_trick(x3) & in(x1,x2) & n_shirt(x2) & a_green(s1) & Theme(s1,x2) & n_man(x1))
exists e1 x1 x2 x3.(n_man(x1) & for(e1,x2) & n_championship(x2) & of(x2,x3) & n_skateboard(x3) & Actor(e1,x1) & v_practice(e1))