who the main characters are until the film is well under way -- and yet it 's hard to stop watching 
(ROOT (S (SBAR (WHNP (WP who)) (S (NP (DT the) (JJ main) (NNS characters)) (VP (VBP are) (SBAR (IN until) (S (NP (DT the) (NN film)) (VP (VBZ is) (PP (ADVP (RB well)) (IN under) (NP (NN way))))))))) (, --) (CC and) (S (ADVP (CC yet)) (NP (NP (PRP it))) (VP (VBZ 's) (ADJP (JJ hard)) (S (VP (TO to) (VP (VB stop) (S (VP (VBG watching))))))))))
(ROOT (S (SBAR (WHNP (WP )) (S (NP (DT ) (JJ ) (NNS )) (VP (VBP ) (SBAR (IN ) (S (NP (DT ) (NN )) (VP (VBZ ) (PP (ADVP (RB )) (IN ) (NP (NN ))))))))) (, ) (CC ) (S (ADVP (CC )) (NP (NP (PRP ))) (VP (VBZ ) (ADJP (JJ )) (S (VP (TO ) (VP (VB ) (S (VP (VBG ))))))))))