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 have no idea about their opening time.
( I ( ( have ( ( no idea ) ( about ( their ( opening time ) ) ) ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBP have) (NP (NP (DT no) (NN idea)) (PP (IN about) (NP (PRP$ their) (VBG opening) (NN time))))) (. .)))