a good chance of being the big 
(ROOT (NP (NP (DT a) (JJ good) (NN chance)) (PP (IN of) (S (VP (VBG being) (NP (DT the) (JJ big)))))))
(ROOT (NP (NP (DT ) (JJ ) (NN )) (PP (IN ) (S (VP (VBG ) (NP (DT ) (JJ )))))))