it falls far short of poetry , but 
(ROOT (S (S (NP (PRP it)) (VP (VBZ falls) (ADVP (RB far) (JJ short) (PP (IN of) (NP (NN poetry)))))) (, ,) (CC but)))
(ROOT (S (S (NP (PRP )) (VP (VBZ ) (ADVP (RB ) (JJ ) (PP (IN ) (NP (NN )))))) (, ) (CC )))