How to use yet, still and already 

Yet means that we are expecting something. (It’s the time to book a holiday.)
Still means ‘going on longer than expected’. (It’s late to be thinking about a holiday.)
Already means ‘sooner than expected’. (It’s early to have had a holiday.)

 

Yet usually goes at the end of a negative statement or a question.
Vicky has got a present, but she hasn’t opened it yet.

Wait a minute. I’m not ready yet.

Have they sent you your cheque yet? ~ No, not yet. I should get it next week.