Task 1
7. Ishould have done.
8. doesn't work, workes
9. had understood
10. sleeps
11. saved
12. will swim
Task 2
5. This cartoon was created by Disney at the beginning of his career.
6. When I came my friend was being interviewed by a journalist.
7. The flowers had been watered by the children before their mother came back from the shop.
8. Their new project will be begun by them next week.
Task 3
7. Suddenly in the dark I felt somebody touched my shoulder.
8. She wanted her son came back home as fast as possible.
9. The old lady was sitting on the bench watching the little children playing in the park.
10. I saw her smoking.
11. If you know about it let me know.
Task 5
4. were, should give
5. were, should go
6. had worked, shouldn't have failed