You did, didn't you?"
( You ( ( ( ( did , ) ( ( did n't ) you ) ) ? ) '' ) )
(ROOT (S (NP (PRP You)) (VP (VBD did) (, ,) (SQ (VBD did) (RB n't) (NP (PRP you)))) (. ?) ('' '')))
Did you do it?
( ( ( Did you ) ( do it ) ) ? )
(ROOT (SQ (VBD Did) (NP (PRP you)) (VP (VB do) (NP (PRP it))) (. ?)))