turn on many people to opera , in general 
(ROOT (VP (VB turn) (PP (IN on) (NP (JJ many) (NNS people))) (PP (TO to) (NP (NN opera))) (, ,) (PP (IN in) (ADJP (JJ general)))))
(ROOT (VP (VB ) (PP (IN ) (NP (JJ ) (NNS ))) (PP (TO ) (NP (NN ))) (, ) (PP (IN ) (ADJP (JJ )))))