Yet, still and ready
Yet means that we are expecting something.
Still means 'going on longer than expected'.
Already means 'sooner than expected'.
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.
In a positive statement, still and already usually go in mid position.
Sarah isn't home yet. She's still at work. We wrote a month ago, and we're still waiting for a reply. I've only been at work an hour, and I'm already exhausted.
There's no need to tell me. I already know.
We can also use still in a negative statement. It goes before haven't, can't, etc.
It's nearly lunch-time, and you still haven't opened your mail. My friend is sixteen, and she still can't swim.
*Compare these sentences. The meanings are similar.
Rita hasn't booked a holiday yet. Rita still hasn't booked a holiday. Still is stronger than yet. It often expresses surprise that the situation has gone on for so long.
In a question still and already usually go after the subject.
Are you still waiting after all this time? Has Tom already been on holiday?