1. Nick has known Tom since he moved to London.
2. Mrs. Harris has been a teacher for twelve years.
3. Felix has lived in Paris since 1998.
4. You haven't played the piano for several weeks.
5. I haven't seen Emma since last week.
6. They have studied English for three months.
7. Sarah hasn't spoken to Eva for five days.
8. We have been there for three hours.
9. He has looked for his keys for a long time.
