1. He hasn't phoned me since August.
2. I haven;t seen her before.
3. It's the first time I have been here.
4. She hasn't worn that dress since her sister's wedding.
5. It is a month since they last phoned us.
6. I haven't met Ba since 2008.
7. I didn't see my brother a month ago.
8. I haven't seen Nam for 2 years.
9. It's 9 months since she last went out with him.
10. I haven't seen Nam for 3 years.
11. She hasn't visited me for 5 months.
13. I haven't written to my uncle since July.
14. We have become close friends for a long time.
16. It's ages since he last chatted with his classmate.
17. I last wrote to you a month ago.