1. This is the first time he visited Ha Long Bay.
➡ He has never visited Ha Long Bay before.

2. She started working here last year.
→ She has been working here since last year.

3. We began eating lunch when it started to rain.
⇒ We have been eating lunch since it started to rain.

4. I last had my hair cut when she left me.
⇒ I haven't had my hair cut since she left me.

5. The last time he met me was 5 months ago.
⇒ He hasn't met me for 5 months.

6. It is a long time since we last met.
⇒ We haven't met for a long time.

7. When did you have this computer?
→ How long have you had this computer?

8. This is the first time I had such a delicious meal.
⇒ I haven't had such a delicious meal before.

9. I haven't gone to work for a month.
⇒ The last time I went to work was a month ago.

10. I haven't talked to him for 5 days.
⇒ It is 5 days since I last talked to him.