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Here are the answers to Exercise 3: 1. There have been a lot of changes in Vietnam since the 1990s. 2. There is no more cheese, I have eaten it all, I'm afraid. 3. It will soon get warm in here. I have turned the heating on. 4. The bill isn't right. They have made a mistake. 5. I just saw Andrew and he says he has done about half of the plan. 6. She hasn't had any fun for a long time. 7. You haven't done your project yet, I suppose. 8. Don't you want to see this programme? It has started. 9. My son has studied English since he was a young man. 10. My brother hasn't had his car repaired since I left him. 11. This is the first time that I have ever eaten this kind of food. 12. My friends have been drinking since it started to rain. Here are the answers to the exercise with the present perfect or past simple of the verbs in brackets: 1. I **have had** these shoes since my eighteenth birthday. 2. We **have lived** in Newcastle for three years now and like it a lot. 3. The last time I **went** to Brighton was in August. 4. When my parents were on holiday, I **stayed** with my grandparents for two weeks. 5. I **haven't seen** Rachel for ages. She **hasn't visited** us since July. 6. Martin **has been** to Greece five times. He loves the place. 7. I **worked** for a computer company for a year. That was after college. 8. We **moved** here in 1993. We **have been** here a long time now. 9. It isn't a very good party. Most people **have already gone** home. 10. It was so hot today that I **wore** shorts and a T-shirt at work. 11. My wife and I **have moved** three times since we **got** married. 12. So far this week there **have been** three burglaries on our street. 13. When I was younger, I **played** badminton for my local team. 14. In the past few years, it **has become** more and more difficult to get into university. 15. This book is so long that I **haven't finished** it yet.