Um, I'm sure I have I just can't think of what.
( Um ( , ( I ( ( 'm ( sure ( I ( have ( I ( just ( ( ca n't ) ( think ( of what ) ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB Um)) (, ,) (NP (PRP I)) (VP (VBP 'm) (ADJP (JJ sure) (SBAR (S (NP (PRP I)) (VP (VBP have) (S (NP (PRP I)) (ADVP (RB just)) (VP (MD ca) (RB n't) (VP (VB think) (PP (IN of) (NP (WP what))))))))))) (. .)))
Give me a minute to think about it some more.
( ( ( Give me ) ( a ( minute ( to ( think ( about ( it ( some more ) ) ) ) ) ) ) ) . )
(ROOT (S (VP (VB Give) (NP (PRP me)) (NP (DT a) (NN minute) (S (VP (TO to) (VP (VB think) (PP (IN about) (NP (NP (PRP it)) (ADJP (DT some) (JJR more))))))))) (. .)))