You've got the keys still, haven't you, Poirot? I asked, as we reached the door of the locked room. 
( ( You ( 've ( ( got ( the keys ) ) still ) ) ) ( , ( ( ( ( have n't ) ( ( you , ) ( ( Poirot ? ) ( I ( ( asked , ) ( as ( we reached ) ) ) ) ) ) ) ( ( the door ) ( of ( the ( locked room ) ) ) ) ) . ) ) )
(ROOT (S (S (NP (PRP You)) (VP (VBP 've) (VP (VBN got) (NP (DT the) (NNS keys)) (ADVP (RB still))))) (, ,) (VP (VBP have) (RB n't) (NP (NP (PRP you)) (, ,) (NP (NP (NNP Poirot) (. ?)) (SBAR (S (NP (PRP I)) (VP (VBD asked) (, ,) (SBAR (IN as) (S (NP (PRP we)) (VP (VBD reached)))))))))) (NP (NP (DT the) (NN door)) (PP (IN of) (NP (DT the) (JJ locked) (NN room)))) (. .)))
As we approached I uttered a question.
( ( As ( we approached ) ) ( I ( ( uttered ( a question ) ) . ) ) )
(ROOT (S (SBAR (IN As) (S (NP (PRP we)) (VP (VBD approached)))) (NP (PRP I)) (VP (VBD uttered) (NP (DT a) (NN question))) (. .)))