5. You haven't tidied this room for weeks.  It’s weeks 7. This is the first time I've been to a night club --> I haven’t 8. I have never watched such a romantic film .--> This is……… 9. He is the mos...

Here are the rewritten sentences: 5. You haven't tidied this room for weeks. -> It's weeks since you tidied this room. 7. This is the first time I've been to a night club -> I haven't been to a night club before. 8. I have never watched such a romantic film -> This is the most romantic film I've ever watched. 9. He is the most humorous man I have ever met -> I have never met such a humorous man. 10. No one has challenged his authority before -> This is the first time someone has challenged his authority. 11. He has lived in Hanoi since he was 12 -> He began living in Hanoi when he was 12. 6. We started looking for a flat 2 months ago -> We have been looking for a flat for 2 months. 12. He began to use the computer when he was 19 -> He has been using the computer since he was 19. 13. This is the first time he has forgotten his bag -> He has never forgotten his bag before. 14. He has never played a computer game before -> This is the first time he has played a computer game. 15. He hasn't chatted with his friends through the Internet for ages -> It's ages since he last chatted with his friends through the Internet.