1. The last time we were to the concert was a year ago.

2. We haven't seen our grandfather for two years.

3. This is the first time I have read a romantic story.

4. My father hasn't seen my uncle for twenty years.

5. It's 20 years since he last was back to his village.

6. We haven't visited Ha Long Bay since 2012.

7. We haven't went to a cinema for two years.

8. We haven't seen him since Monday.

9. I haven't seen David since 1989.

10. Has Mai come to Sai Gon yet?