parents beware ; this is downright movie penance 
(ROOT (S (S (NP (NNS parents)) (VP (VBP beware))) (, ;) (S (NP (DT this)) (VP (VBZ is) (ADVP (RB downright)) (NP (NN movie) (NN penance))))))
(ROOT (S (S (NP (NNS )) (VP (VBP ))) (, ) (S (NP (DT )) (VP (VBZ ) (ADVP (RB )) (NP (NN ) (NN ))))))