7. By the time I get to bed I **will have been working** for 8 hours.

8. Jane **has not arrived** yet. I **have been waiting** since noon, but there's no sign of her.

9. Yesterday, while I **was sitting** in class, I had a nosebleed. The boy who **was sitting** next to me gave me a paper handkerchief.

10. All the passengers **had fastened** their seat belts by the time the pilot made his announcement.

11. I'll return his wallet the next time I **see** him.

12. A small stone struck the windshield while we **were driving** down the gravel road.

13. My grandfather **has never flown** in an airplane before and he doesn't plan to do so.

14. At the moment we **are having** a long spell of rain. It **has been raining** constantly for the last three days.

15. When I got to the party last night, the other guests **had already arrived**.