proof once again that if the filmmakers just follow the books , they ca n't go wrong . 
(ROOT (S (VP (NN proof) (ADVP (RB once) (RB again)) (SBAR (IN that) (S (SBAR (IN if) (S (NP (DT the) (NNS filmmakers)) (ADVP (RB just)) (VP (VBP follow) (NP (DT the) (NNS books))))) (, ,) (NP (PRP they)) (VP (MD ca) (RB n't) (VP (VB go) (ADVP (JJ wrong))))))) (. .)))
(ROOT (S (VP (NN ) (ADVP (RB ) (RB )) (SBAR (IN ) (S (SBAR (IN ) (S (NP (DT ) (NNS )) (ADVP (RB )) (VP (VBP ) (NP (DT ) (NNS ))))) (, ) (NP (PRP )) (VP (MD ) (RB ) (VP (VB ) (ADVP (JJ ))))))) (. )))