Don't you know?
( ( ( ( Do n't ) you ) know ) ? )
(ROOT (SQ (MD Do) (RB n't) (NP (PRP you)) (VP (VB know)) (. ?)))
Do you not know?
( ( ( Do you ) ( not know ) ) ? )
(ROOT (SQ (VBP Do) (NP (PRP you)) (VP (RB not) (VB know)) (. ?)))