1. The man is believed to have escaped in a stolen car.
2. The test was so difficult that we couldn't do it.
3. Had it not been for your help, I couldn't have finished my project.
4. You had better not tell anybody about the discovery.
5. The orphanage would have closed down if it it had not been for his generous contribution.
6. There has been a considerable increase in the cost of living in the last few years.
7. No matter how long you use it, it won't wear out.
8. The harder you work, the more successful you become.