1. I have already read this book. 2. He has called and hung up. 3. I have just bumped into Jim in the library. 4. I broke my bicycle yesterday. 5. You can't ride my bike. I've broken it. 6. Who has eaten my cake? 7. When I was in Miami I often went to the beach. 8. You've been kind of weird lately. 9. The teacher explained this rule yesterday. 10. Have you ever been to China? 11. Who wrote the Harry Potter books? 12. Alex sold his bicycle to his neighbour last week. 13. I haven't told her about it yet. 14. Anthony moved to this town in 2013. 15. Bob has never seen the sea.