have to pay if you want to see it 
(ROOT (S (VP (VB have) (S (VP (TO to) (VP (VB pay) (SBAR (IN if) (S (NP (PRP you)) (VP (VBP want) (S (VP (TO to) (VP (VB see) (NP (PRP it))))))))))))))
(ROOT (S (VP (VB ) (S (VP (TO ) (VP (VB ) (SBAR (IN ) (S (NP (PRP )) (VP (VBP ) (S (VP (TO ) (VP (VB ) (NP (PRP ))))))))))))))