1. "I am sorry that I broke the glass" said Peter.
-> Peter apologized for breaking the glass.
2. I was downing, but he saved me.
-> If he hadn't saved me, I would have downed. 
3. We can't afford to buy the car.
-> The car is too expensive (for us) to buy.
4. His parents made him study hard for the exams.
-> He was made to study hard for the exams by his parents. 
5. He has never behaved so violent before.
-> He is behaving more violently than ever before. 
6. We couldn't get nearer because of the police.
-> The police wouldn't allow us to get/ let us get nearer.