Do you think that's what it was?
( ( ( Do you ) ( think ( that ( 's ( what ( it was ) ) ) ) ) ) ? )
(ROOT (SQ (VBP Do) (NP (PRP you)) (VP (VB think) (SBAR (IN that) (S (VP (VBZ 's) (SBAR (WHNP (WP what)) (S (NP (PRP it)) (VP (VBD was)))))))) (. ?)))
That can't be it, you don't think?!
( ( That ( ( ca n't ) ( be it ) ) ) ( , ( you ( ( do n't ) ( think ?! ) ) ) ) )
(ROOT (S (SBAR (IN That) (S (VP (MD ca) (RB n't) (VP (VB be) (NP (PRP it)))))) (, ,) (NP (PRP you)) (VP (VBP do) (RB n't) (VP (VB think) (NP (NNS ?!))))))