Are you sure?
( ( ( Are you ) sure ) ? )
(ROOT (SQ (VBP Are) (NP (PRP you)) (ADJP (VBG sure)) (. ?)))
Are you certain?
( ( Are ( you certain ) ) ? )
(ROOT (SQ (VP (VB Are) (S (NP (PRP you)) (ADJP (JJ certain)))) (. ?)))