trying to sneak out of the theater 
(ROOT (S (VP (VBG trying) (S (VP (TO to) (VP (VB sneak) (PP (IN out) (PP (IN of) (NP (DT the) (NN theater))))))))))
(ROOT (S (VP (VBG ) (S (VP (TO ) (VP (VB ) (PP (IN ) (PP (IN ) (NP (DT ) (NN ))))))))))