OK, I said, So, how do we do it?
( OK ( , ( I ( ( ( ( ( said , ) So ) , ) ( how ( do ( we ( do it ) ) ) ) ) ? ) ) ) )
(ROOT (S (INTJ (UH OK)) (, ,) (NP (PRP I)) (VP (VBD said) (, ,) (ADVP (RB So)) (, ,) (SBAR (WHADVP (WRB how)) (S (VP (VBP do) (SBAR (S (NP (PRP we)) (VP (VBP do) (NP (PRP it))))))))) (. ?)))
I knew how to do it. 
( I ( ( knew ( how ( to ( do it ) ) ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBD knew) (SBAR (WHADVP (WRB how)) (S (VP (TO to) (VP (VB do) (NP (PRP it))))))) (. .)))