1. I have not seen him since yesterday.
2. We have known John for five years
3. Katya has been ill for a week.
4. They have not opened this room since last spring.
5. My brother has been in Siberia for a month.
6. This ring has belonged to me for many years.
7. We have not been to the movies since last month.
8. My mother has loved classical music since childhood.
9. This TV has been with us for ten years.
10. Elena has not visited her grandmother for three months.