you did you see that
( you ( did ( you ( see that ) ) ) )
(ROOT (S (NP (PRP you)) (VP (VBD did) (SBAR (S (NP (PRP you)) (VP (VBP see) (NP (DT that))))))))
Did you see that?
( ( ( Did you ) ( see that ) ) ? )
(ROOT (SQ (VBD Did) (NP (PRP you)) (VP (VB see) (NP (DT that))) (. ?)))