Umm, I guess I'll leave it at that.
( Umm ( , ( I ( ( guess ( I ( 'll ( ( leave it ) ( at that ) ) ) ) ) . ) ) ) )
(ROOT (S (ADVP (RB Umm)) (, ,) (NP (PRP I)) (VP (VBP guess) (SBAR (S (NP (PRP I)) (VP (MD 'll) (VP (VB leave) (NP (PRP it)) (PP (IN at) (NP (DT that)))))))) (. .)))
I think I'll stop now.
( I ( ( think ( I ( 'll ( stop now ) ) ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBP think) (SBAR (S (NP (PRP I)) (VP (MD 'll) (VP (VB stop) (ADVP (RB now))))))) (. .)))