1) 1. By the time Paul came back home, I Have sweeped the floor
2. Jill has been waiting for half an hour before the bus came
3. I never have been to the Bahamas
4. The librarian gave me the book which I have been waiting for the month
2) 1. Our friend is thought about all the time
2. He wil be operated in a week
3. The pupil's parents were sent for
4. The branch on a tree was broken by elephant