it 's not a bad premise , just a bad movie . 
(ROOT (S (NP (PRP it)) (VP (VBZ 's) (RB not) (NP (NP (DT a) (JJ bad) (NN premise)) (, ,) (NP (RB just) (DT a) (JJ bad) (NN movie)))) (. .)))
(ROOT (S (NP (PRP )) (VP (VBZ ) (RB ) (NP (NP (DT ) (JJ ) (NN )) (, ) (NP (RB ) (DT ) (JJ ) (NN )))) (. )))