is n't mainly suspense or excitement . 
(ROOT (S (VP (VBZ is) (RB n't) (ADVP (RB mainly)) (NP (NN suspense) (CC or) (NN excitement))) (. .)))
(ROOT (S (VP (VBZ ) (RB ) (ADVP (RB )) (NP (NN ) (CC ) (NN ))) (. )))