It's mighty lucky you did say it.
( It ( ( 's ( mighty ( lucky ( you ( did ( say it ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP It)) (VP (VBZ 's) (ADJP (RB mighty) (JJ lucky) (SBAR (S (NP (PRP you)) (VP (VBD did) (VP (VB say) (NP (PRP it)))))))) (. .)))
I don't know why you said it.
( I ( ( ( do n't ) ( know ( why ( you ( said it ) ) ) ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBP do) (RB n't) (VP (VB know) (SBAR (WHADVP (WRB why)) (S (NP (PRP you)) (VP (VBD said) (NP (PRP it))))))) (. .)))