1. It's not five yet. It's not seven yet. It's not eleven yet.
2. Is it seven already? Is it five already? Is it eleven already?
3. She's not eleven yet, she's only ten. He's not nineteen yet, he's only seventeen. She's not fifty five yeat, she's only fifty. She's not old yet.
4. Is Miss Deen at her place? - Not yet.
5. Is he still at his place? - Yes.
6. Is Bill already in his hotel? - Not yet. He's busy at his shop.
Не уверен насчет перевода ''у себя'' в 4 и 5.