turn on many people to opera , 
(ROOT (S (VP (VB turn) (PRT (IN on)) (NP (JJ many) (NNS people)) (PP (IN to) (NP (NN opera)))) (, ,)))
(ROOT (S (VP (VB ) (PRT (IN )) (NP (JJ ) (NNS )) (PP (IN ) (NP (NN )))) (, )))