the predominantly amateur cast is painful to watch , so stilted and unconvincing are the performances . 
(ROOT (S (NP (DT the) (ADJP (RB predominantly) (JJ amateur)) (NN cast)) (VP (VBZ is) (ADJP (JJ painful) (SBAR (S (VP (TO to) (VP (VB watch)))))) (, ,) (SINV (ADJP (RB so) (JJ stilted) (CC and) (JJ unconvincing)) (VP (VBP are)) (NP (DT the) (NNS performances)))) (. .)))
(ROOT (S (NP (DT ) (ADJP (RB ) (JJ )) (NN )) (VP (VBZ ) (ADJP (JJ ) (SBAR (S (VP (TO ) (VP (VB )))))) (, ) (SINV (ADJP (RB ) (JJ ) (CC ) (JJ )) (VP (VBP )) (NP (DT ) (NNS )))) (. )))