Sentence: which case did poirot solve
(Start:
  (S[Agr +]:
    (NP[wh +]: (NP1[wh +]: (WhDet: 'which') (N: 'case')))
    (Dop: 'did')
    (NP: (N: 'poirot'))
    (VP[wh +]: (Vtran: 'solve'))))@[0w:5w]

Sentence: who solved the case
(Start:
  (S:
    (NP: (N: 'who'))
    (VP[wh -]:
      (Vtran: 'solve+ed')
      (NP[wh -]: (NP1[wh -]: (Det: 'the') (N: 'case'))))))@[0w:4w]

Sentence: which solution did poirot send to the police
(Start:
  (S[Agr +]:
    (NP[wh +]: (NP1[wh +]: (WhDet: 'which') (N: 'solution')))
    (Dop: 'did')
    (NP: (N: 'poirot'))
    (VP[wh +]:
      (Vtran1: 'send')
      (PP[wh -]:
        (P: 'to')
        (NP[wh -]: (NP1[wh -]: (Det: 'the') (N: 'police')))))))@[0w:8w]

Sentence: which detectives solved the case
(Start:
  (S:
    (NP[wh +]:
      (NP1[wh +]: (WhDet: 'which') (N: 'detective+s')))
    (VP[wh -]:
      (Vtran: 'solve+ed')
      (NP[wh -]: (NP1[wh -]: (Det: 'the') (N: 'case'))))))@[0w:5w]

Sentence: which solution did poirot believe that the detectives sent to the police
(Start:
  (S[Agr +]:
    (NP[wh +]:
      (NP1[wh +]: (WhDet: 'which') (N: 'solution')))
    (Dop: 'did')
    (NP: (N: 'poirot'))
    (VP[wh +]:
      (Vsbar: 'believe')
      (SBAR[wh +]:
        (Comp: 'that')
        (SBAR[wh +]:
          (NP[wh -]:
            (NP1[wh -]: (Det: 'the') (N: 'detective+s')))
          (VP[wh +]:
            (Vtran1: 'sent')
            (PP[wh -]:
              (P: 'to')
              (NP[wh -]:
                (NP1[wh -]: (Det: 'the') (N: 'police'))))))))))@[0w:12w]

Sentence: to whom did poirot send the solutions
(Start:
  (S[Agr ?x]:
    (PP[wh +]:
      (P: 'to')
      (NP[wh +]: (NP1[wh +]: (WhPron: 'whom'))))
    (Dop: 'did')
    (NP: (N: 'poirot'))
    (VP[wh +]:
      (Vtran1: 'send')
      (NP1[wh -]: (Det: 'the') (N: 'solution+s')))))@[0w:7w]

Sentence: which solution did poirot send the gun to the police
No parses.

Sentence: who solved
No parses.