Yet, still, and already are time adverbs that are often confused. They all relate to time, but they express different ideas: expectation, continuation, or completion.
Use yet in negative sentences and questions to talk about something that has not happened but is expected.
Position: usually at the end of the sentence.
Use already to say something happened before now, often sooner than expected.
Position: before the main verb or after “have”.
Use still to say that a situation continues and has not changed.
Position: before the main verb (or after “be”).
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