• 'Just' used with the present perfect means 'a short time before'.
Example: He just got back from Italy.
• 'Yet' used with the present perfect means 'at any time up to now'. We use it to emphasise that we expect something to happen soon.
Example: We haven't decorated the tree yet.
• 'Already' used with the present perfect means 'before now'.
Example: They have already seen that play.
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