they need it to sell us on this twisted love story 
(ROOT (S (NP (PRP they)) (VP (VBP need) (NP (PRP it)) (S (VP (TO to) (VP (VB sell) (NP (PRP us)) (PP (IN on) (NP (DT this) (VBN twisted) (NN love) (NN story)))))))))
(ROOT (S (NP (PRP )) (VP (VBP ) (NP (PRP )) (S (VP (TO ) (VP (VB ) (NP (PRP )) (PP (IN ) (NP (DT ) (VBN ) (NN ) (NN )))))))))