Giúp mk với ạ

1. We started living here fifteen years ago. → We have been living here for fifteen years. 2. Minh began to collect stamps in 2006.→ Minh has been collecting stamps since 2006. 3. It's three months since I last spoke to her.→ I haven't spoken to her for three months. 4. The last time she visited me was five months ago,→ She hasn't visited me for five months. 5. I last wrote to my uncle in June. I haven't written to my uncle since June. 6. It's a long time since we became close friends. → We have been close friends for a long time. 7. The last time I went swimming was when I was in my hometown. I haven't gone swimming since then. 8. It's nearly 20 years since my father saw his brother. My father hasn't seen his brother for nearly 20 years. 9. I haven't gone to the library for two weeks. It's two weeks since I went to the library. 10. How long have you lived here? When did you start living here? 11. It's two years since I last saw Minh. I haven't seen Minh for two years. 12. This is the first time he has gone abroad. He hasn't gone abroad before. 13. How long is it since you used this computer? → When did you last use this computer? 14. He last came back to his home village five months ago. → He hasn't come back to his home village for five months. 15. When did you last ride a bike? How long is it since you last rode a bike? 16. I've never eaten Chinese food before -This is the first time I have eaten Chinese food. 17. I've been to Sai Gon twice. This is my second time going to Sai Gon. 18. 1 haven't seen him for two months. It is two months since I last saw him. The last time I saw him was two months ago. 19. How long is it since you last saw him? When did you last see him? 20. He hasn't written to his sister for four months. It is four months since he last wrote to his sister. The last time he wrote to his sister was four months ago. 21. I haven't been to the circus for three months. The last time I went to the circus was three months ago. It is three months since I last went to the circus.