predominantly amateur cast is painful to watch , 
(ROOT (S (NP (ADJP (RB predominantly) (JJ amateur)) (NN cast)) (VP (VBZ is) (ADJP (JJ painful) (SBAR (S (VP (TO to) (VP (VB watch))))))) (, ,)))
(ROOT (S (NP (ADJP (RB ) (JJ )) (NN )) (VP (VBZ ) (ADJP (JJ ) (SBAR (S (VP (TO ) (VP (VB ))))))) (, )))