be thinking about going to see this movie 
(ROOT (S (VP (VB be) (VP (VBG thinking) (PP (IN about) (S (VP (VBG going) (S (VP (TO to) (VP (VB see) (NP (DT this) (NN movie))))))))))))
(ROOT (S (VP (VB ) (VP (VBG ) (PP (IN ) (S (VP (VBG ) (S (VP (TO ) (VP (VB ) (NP (DT ) (NN ))))))))))))