(+)
1. I have asked him.
2. You have guessed it!
3. I have believed you!
4. I have helped you.
5. You have warned me.
(-)
1. You haven't heard anything.
2. I haven't noticed anything.
3. I have never understood music.
4. I have never stolen anything.
5. You haven't done anything.
(?)
1. What have you closen?
2. What have I written?
3. What have you noticed?
4. What have they found?
5. Have you seen them?