is n't in this film , which may be why it works as well as it does 
(ROOT (S (VP (VBZ is) (RB n't) (PP (IN in) (NP (DT this) (NN film)))) (, ,) (SBAR (WHNP (WDT which)) (S (VP (MD may) (VP (VB be) (SBAR (WHADVP (WRB why)) (S (NP (PRP it)) (VP (VBZ works) (ADVP (ADVP (RB as) (RB well)) (SBAR (IN as) (S (NP (PRP it)) (VP (VBZ does))))))))))))))
(ROOT (S (VP (VBZ ) (RB ) (PP (IN ) (NP (DT ) (NN )))) (, ) (SBAR (WHNP (WDT )) (S (VP (MD ) (VP (VB ) (SBAR (WHADVP (WRB )) (S (NP (PRP )) (VP (VBZ ) (ADVP (ADVP (RB ) (RB )) (SBAR (IN ) (S (NP (PRP )) (VP (VBZ ))))))))))))))