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