1. I have already written a letter. 2. They have just read a book. 3. My sister has lost her key. 4. My mother has bought an interesting book at the shop. 5. Have you ever been to London? 6. He has just finished his work. 7. I have never been to France. 8. I haven't seen you for ages. 9. She has just left the room. 10. She has already done her work.