's supposed to be a romantic comedy 
(ROOT (S (VP (VBZ 's) (VP (VBN supposed) (S (VP (TO to) (VP (VB be) (NP (DT a) (JJ romantic) (NN comedy)))))))))
(ROOT (S (VP (VBZ ) (VP (VBN ) (S (VP (TO ) (VP (VB ) (NP (DT ) (JJ ) (NN )))))))))