1. I have just eaten my lunch.(+)
I haven't eaten my lunch yet.(-)
Have you eaten your lunch?
2. I have been to the USA twice.(+)
Have you ever been to the USA?
I have never been to the USA.(-)
3. I have already done my task.
Have you done your task yet?
I haven't done my task yet.
4. He has never seen this film.
He has already seen this film.
Has he ever seen this film?
5. They have already gone.
Have they gone yet?
They haven't gone yet.
6. My friend has called me.
Has my friend called me?
My friend hasn't called me this week.
7. We have read this story.
Have you read this story?
We haven't read this story yet.
8. She has eaten her dinner.
Has she eaten her dinner?
She hasn't eaten her dinner yet.
9. The secretary has posted the letters.
Has the secretary posted the letters?
She hasn't posted the letters yet.
10. My mother has given me the money.
Who has given you the money?
She hasn't given me any money.
11. We have already written the dictation.
Who has written the dictation?
We haven't written the dictation yet.
12. It has eaten its food.
Has the dog eaten its food?
It hasn't eaten its food.