0
  1. Who did find my keys?
    is wrong "Who found my keys?" is right

while:

  1. Which film did you see yesterday evening?
    is right.
  2. Why did she phone you yesterday?
    is right.

Those are question I answered at face2face course.

2

It isn't just about the past simple tense form but about whether you want to ask about a subject or an object. We usually use the wh-words who, whose, which and what both as subject and object but with a slight difference. For example:

  • Who is the best footballer in the world? (who as subject) (He is the best footballer because.....)

  • Who did you meet? (who as object) (I met Dunken...)

  • What happened after that? (what as subject) (This was what happened next...)

  • What did you say? (what as object). (I said thatshe left ...)

  • So The question here Who Did Find My Keys? is wrong because you ask about the subject( suppose the answer is: Sue found my keys). So "Who Found My Keys?" is correct.

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