strictly speaking, you should use "already" in case there was some action that happened before one's expected: e.g do you already have it? (I wasn't expecting him to get something very soon) have you already eaten? (I wasn't expecting him to eat something so fast) the rules says that the adverb should come before the verb/participle but I've seen that you can break the rules when you want to add emphasis on the adverb (already) but I think you should stick to the rules when it comes to take tests. and you should use "yet" in questions and in negative clauses for things that has not happened by a particular time: e.g A: Have you eaten yet? (I know he hasn't still eaten something) B: No, I haven't eaten yet "yet" ALWAYS comes at the end of the sentence/question I've also found this useful resource to complete my original idea, hope this helps you https://learnenglish.britishcouncil.org/en/english-grammar/already-still-yet-and-no-longer