 We're just, we just we don't know who he is.
( We ( ( ( ( 're just ) , ) ( we ( just ( we ( ( do n't ) ( know ( who ( he is ) ) ) ) ) ) ) ) . ) )
(ROOT (S (NP (PRP We)) (VP (VBP 're) (ADVP (RB just)) (, ,) (S (NP (PRP we)) (SBAR (RB just) (S (NP (PRP we)) (VP (VBP do) (RB n't) (VP (VB know) (SBAR (WHNP (WP who)) (S (NP (PRP he)) (VP (VBZ is)))))))))) (. .)))
We know exactly who he is.
( We ( ( know ( ( exactly who ) ( he is ) ) ) . ) )
(ROOT (S (NP (PRP We)) (VP (VBP know) (SBAR (WHNP (RB exactly) (WP who)) (S (NP (PRP he)) (VP (VBZ is))))) (. .)))