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Present perfect and Past simple

 Tech-d 2014-07-04
Tom is looking for his key. He can't find it.
-- He has lost his key. (PP)
   (He doesn't have his key now.) 

10 mins later:
Now Tom has found his key. He has it now.
-- Has he lost his key ? (PP)
-- No, he hasn't. He has found it. 

--Did he lose his key? (Past Simple)
-- Yes, he did.

He lost his key (Past Simple), but now he has found it. (PP)





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