1. This is the first time he went abroad.
=> He hasn't been abroad before.

2. This is the first time I had such a delicious meal.
=> I haven't had such a delicious meal before.

3. She hasn't played this game well before.
=> This is the first time she has played this game well.

4. She started driving 1 month ago.
=> She has been driving for 1 month.

5. We began eating when it started to rain.
=> We have been eating since it started to rain.

6. She has taught the children in this remote village for five months.
=> She started teaching the children in this remote village five months ago.

7. I have lived in Ho Chi Minh City since I was 8.
=> I began living in Ho Chi Minh City when I was 8.

8. I last had my hair cut when I left her.
=> I haven't had my hair cut since I left her.

9. They last talked to each other two months ago.
=> They haven't talked to each other for two months.

10. She hasn't had a swim for five years.
=> She last had a swim five years ago.

11. I haven't met Linda for 2 weeks.
=> I last met Linda 2 weeks ago.

12. The last time she kissed me was 5 months ago.
=> She hasn't kissed me for 5 months.

13. The last time she saw her elder sister was in 1999.
=> She hasn't seen her elder sister since 1999.

14. He hasn't written to me since April.
=> The last time he wrote to me was in April.

15. I haven't seen him for 8 days.
=> The last time I saw him was 8 days ago.

16. It is a long time since we last met.
=> We haven't met for a long time.

17. It is 5 years since I last visited my grandparents.
=> I haven't visited my grandparents for 5 years.

18. I haven't taken a bath since Monday.
=> It is since Monday that I have taken a bath. (or) It is Monday since I last took a bath.

19. When did you have it?
=> How long ago did you have it?

20. How long have you bought that bag?
=> When did you buy that bag?