1. Nobody has seen him since last Friday.
2. It has been foggy for some days.
3. He has been finishing since six o'clock.
4. They've been living in France for eight years.
5. The pilots have been on strike for two months.
6. We've had terrible weather since Sunday.
7. I've known Tom since 1990.
8. We have been waiting for the bus for half an hour.
9. She hasn't lost a match since April.
10. Things have changed since he became the headmaster.
11. The police have been looking for him for a month.
12. Our dog has been ill for two days.
13. I've been looking for this book for a long time.
14. I've been working since I got up.
15. The kettle has been boiling for ten minutes.
