, like i already mentioned ... it 's robert duvall ! 
(ROOT (S (, ,) (SBAR (IN like) (S (NP (PRP i)) (ADVP (RB already)) (VP (VBD mentioned)))) (, ...) (NP (PRP it)) (VP (VBZ 's) (NP (NNP robert) (NNP duvall))) (. !)))
(ROOT (S (, ) (SBAR (IN ) (S (NP (PRP )) (ADVP (RB )) (VP (VBD )))) (, ) (NP (PRP )) (VP (VBZ ) (NP (NNP ) (NNP ))) (. )))