I have to tell you, I tried to understand it.
( ( I ( have ( to ( tell you ) ) ) ) ( , ( I ( ( tried ( to ( understand it ) ) ) . ) ) ) )
(ROOT (S (S (NP (PRP I)) (VP (VBP have) (S (VP (TO to) (VP (VB tell) (NP (PRP you))))))) (, ,) (NP (PRP I)) (VP (VBD tried) (S (VP (TO to) (VP (VB understand) (NP (PRP it)))))) (. .)))
I have figured it out.
( I ( ( have ( ( figured it ) out ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBP have) (VP (VBN figured) (NP (PRP it)) (PRT (RP out)))) (. .)))