um ... is n't that the basis for the entire plot ? 
(ROOT (FRAG (INTJ (UH um)) (, ...) (SQ (VBZ is) (RB n't) (NP (DT that)) (NP (NP (DT the) (NN basis)) (PP (IN for) (NP (DT the) (JJ entire) (NN plot))))) (. ?)))
(ROOT (FRAG (INTJ (UH )) (, ) (SQ (VBZ ) (RB ) (NP (DT )) (NP (NP (DT ) (NN )) (PP (IN ) (NP (DT ) (JJ ) (NN ))))) (. )))