Present Perfect

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We use this tense to talk about actions that started in the past and they are still going on or with actions that have some influence in the present.

Exercises , more exercises here.

And you know that this tense is usually accompanied of already, just, or yet.

Exercises using: already, just, still and yet (by Auto-English).
British Council explains the meaningof the above words.

Would you dare to take the BBC challenge?
For or since?