1. If I didn't do my homework everynight, i wouldn't get good grades
2.  Jack tole Nancy that he jogged along the riverbank at dawn
3. Susan told Tom that he had studied together at the library previous day
4. She bought a new book which cover is really beautiful yesterday
5. He has started working on the project a few weeks before
6. The project must be finished by these architects by friday
7. If they were hardworking, they could pass the exam easily