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)))) (. .)))
I had the keys in my pocket.
( I ( ( had ( ( the keys ) ( in ( my pocket ) ) ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBD had) (NP (NP (DT the) (NNS keys)) (PP (IN in) (NP (PRP$ my) (NN pocket))))) (. .)))