помогите сосотавить 9 предложени в форме Present Perfectй 3 вопросительных 3 отрицательных 3 утвердительных

спасибо большое

1. I have just saw my best friend 2. I've just finished doing my homework 3. She has just bought this cake 4. I have never been to France 5. She hasn't returned yet 6. We have never saw your mum 7. Have you ever been to England? 8. Have you ever tried so tasty salad? 9. Why hasn't she done her homework yet?