1. I have lived here 4 years.
2. They haven't visited me last summer.
3. Paul's studied French 12 years.
4. We've been friends we met.
5. They've worked here 2006.
6. She's played in the orchestra she left university.
7. We've known about the problem ages.
8. I've been interested in music I was a child.
9. He hasn't seen Steven a long time.
10. We have studied months.