i don't know um-hum
( i ( ( do n't ) ( know um-hum ) ) )
(ROOT (S (NP (FW i)) (VP (VBP do) (RB n't) (VP (VB know) (NP (NN um-hum))))))
I know very well.
( I ( ( know ( very well ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBP know) (ADVP (RB very) (RB well))) (. .)))