I am not.
( I ( ( am not ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBP am) (RB not)) (. .)))
I am not new to this.
( I ( ( ( am not ) ( new ( to this ) ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBP am) (RB not) (ADJP (JJ new) (PP (TO to) (NP (DT this))))) (. .)))