We often use the present perfect with the adverbs just, yet and already:
1) We use just for very recent events:
Dad has just arrived.
My brother has just finished.
2) We use yet when we are expecting something to happen: yet normally goes at the end of a clause
It's nearly 10o'clock. Has Ayse woken up yet?
They have not finished breakfast yet.
We use yet in this way only in questions and negatives.
3) We use already when something has happened sooner than expected.
Could you do the washing up ?
I have already done it.
