I really don't.
( I ( really ( ( do n't ) . ) ) )
(ROOT (S (NP (PRP I)) (ADVP (RB really)) (VP (VBP do) (RB n't)) (. .)))
Indeed I do.
( Indeed ( I ( do . ) ) )
(ROOT (S (ADVP (RB Indeed)) (NP (PRP I)) (VP (VBP do)) (. .)))