Tell me, how did those scribbled words on the envelope help you to discover that a will was made yesterday afternoon?" Poirot smiled. 
( ( ( ( ( Tell me ) , ) ( how ( did ( those ( ( ( ( scribbled words ) ( on ( the envelope ) ) ) ( help ( you ( to ( discover ( that ( ( a will ) ( was ( made yesterday ) ) ) ) ) ) ) ) ) afternoon ) ) ) ) ) ? ) ( '' ( Poirot ( smiled . ) ) ) )
(ROOT (S (SQ (VP (VB Tell) (NP (PRP me)) (, ,) (SBAR (WHADVP (WRB how)) (S (VP (VBD did) (SBAR (S (NP (DT those)) (VP (VBD scribbled) (NP (NNS words)) (PP (IN on) (NP (DT the) (NN envelope))) (S (VP (VB help) (S (NP (PRP you)) (VP (TO to) (VP (VB discover) (SBAR (IN that) (S (NP (DT a) (NN will)) (VP (VBD was) (VP (VBN made) (NP (NN yesterday))))))))))) (NP (NN afternoon))))))))) (. ?)) ('' '') (NP (NNP Poirot)) (VP (VBD smiled)) (. .)))
How could you not figure out that there was a will written yesterday?
( How ( ( could ( you ( not ( ( figure out ) ( that ( there ( was ( ( a will ) ( written yesterday ) ) ) ) ) ) ) ) ) ? ) )
(ROOT (SBARQ (WHADVP (WRB How)) (S (MD could) (NP (PRP you)) (VP (RB not) (VP (VB figure) (PRT (RP out)) (SBAR (IN that) (S (NP (EX there)) (VP (VBD was) (NP (NP (DT a) (NN will)) (VP (VBN written) (NP (NN yesterday)))))))))) (. ?)))