1. I've been to the library today.
2. You've kept a pet for three years.
3. Have you eaten Thai food before?
4. Has it rained all day?
5. Who have we forgotten to invite?
6. We haven't heard that song already.
7. He hasn't forgotten his books.
8. She has stolen all the chocolate!
9. Have I explained it well?
10. Who has he met recently?
