Have you seen Dave yet? (to me it's just a typical question) Yes. You are expecting that your listener will see Dave if he hasn't already.
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CalifJim
Simon's left the party. (It's only nine o'clock)
Would you write: Simon has already left the party OR Simon has just left the party. ----I would write "just" By specifying only, it seems you are emphasizing your expectation that it may be too early to leave. Use already.