I am not.
( I ( ( am not ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBP am) (RB not)) (. .)))
No, I'm not.
( No ( , ( I ( ( 'm not ) . ) ) ) )
(ROOT (S (INTJ (UH No)) (, ,) (NP (PRP I)) (VP (VBP 'm) (RB not)) (. .)))