1. You have kept a pet for three years.
2. Have you eaten Thai food before?
3. It has rained all day.
4. Who have we forgotten to invite?
5. We haven't heard that song already.
6. He hasn't forgotten his book.
7. She has stolen all the chcolate.
8. Have I explained it well?
9. Who he has met recently?
10. How have we finished already?
11. He has studied Latin.
12. I have known him fot three months.
