Already means sooner than expected and usually goes before the main verb: I've already eaten. Yet is for questions and negatives and goes at the end: Have you eaten yet? I haven't eaten yet.
Same situation, two choices. Pick an example.
I've already eaten.
It's done, maybe earlier than expected. Before the main verb.
I haven't eaten yet.
Expected, but not done (or is it?). At the end.
| Rule | Already | Yet |
|---|---|---|
| Meaning | Sooner than expected | Up to now (it's expected to happen) |
| Position | Before the main verb (sometimes at the end) | At the end |
| Used in | Positive sentences, surprised questions | Negatives and questions |
| Example | The film has already started! | Has the film started yet? |
Don't worry, I've _____ paid.
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Yes, to show surprise that something happened so soon: Have you already finished? Wow! For a neutral question, use yet.