1. came, told, had left
2. had been helping, arranged
3. left, the snow had already stopped, was shining
4. found, had made
5. had been waiting, hasn't received
6. were drinking, rang
7. have been waiting
8. began, he is still writing it
9. is, is doing
10. was waiting, saw
11. What are you watching? I'm watching ....... - How long have you been watching it? I've been watching it for an hour.