impossible to claim that it is `` based on a true story '' 
(ROOT (ADJP (JJ impossible) (S (VP (TO to) (VP (VB claim) (SBAR (IN that) (S (NP (PRP it)) (VP (VBZ is) (`` ``) (VP (VBN based) (PP (IN on) (NP (DT a) (JJ true) (NN story)))))))))) ('' '')))
(ROOT (ADJP (JJ ) (S (VP (TO ) (VP (VB ) (SBAR (IN ) (S (NP (PRP )) (VP (VBZ ) (`` ) (VP (VBN ) (PP (IN ) (NP (DT ) (JJ ) (NN )))))))))) ('' )))