Did you go door to door?
( ( ( Did you ) ( go ( door ( to door ) ) ) ) ? )
(ROOT (SQ (VBD Did) (NP (PRP you)) (VP (VB go) (ADVP (NN door) (TO to) (NN door))) (. ?)))
Did you bring a clipboard, if you went door to door?
( ( ( Did you ) ( ( ( bring ( a clipboard ) ) , ) ( if ( you ( went ( door ( to door ) ) ) ) ) ) ) ? )
(ROOT (SQ (VBD Did) (NP (PRP you)) (VP (VB bring) (NP (DT a) (NN clipboard)) (, ,) (SBAR (IN if) (S (NP (PRP you)) (VP (VBD went) (ADVP (NN door) (TO to) (NN door)))))) (. ?)))