1. Where have you been? - I've been to the dentist. 2. Have you had breakfast? - Yes, I have. 3. Has the post come? - Yes, it has. 4. Have you seen my watch anywhere? - No, I'm afraid I have not. 5. Has someone winded the clock? - Yes, Tom has. 6. I haven't finished my letter yet. 7. He has just gone out. 8. Someone has taken my bicycle. 9. The phone has stopped ringing, 10. Have you heard from her lately? - No, I have not. 11. I have just washed that floor. 12. The cat has stolen the fish.