1. The fireman rushed into the burning house because he wanted to save the child ->The fireman rushed into the burning house so as to save the child
2. He didn't tell me he was sick because he didn't want to worry me ->He didn't tell me so as not to worry me
3. She introduced me to Dr Felix last year ->I was introduced to Dr.Felix by her last year
4. The earthquake has killed a lot of people in the town ->A lot of people have been killed by the earthquake
5. Thomas Edison invented the phonograph in 1877 ->The phonograph was invented by Thomas Edison in 1877
6. I've decided to clean my house this afternoon ->I'm going to clean my house this afternoon
7. Have you decided to take this examination? ->Are you going to take this examination?
8. She's decided to buy that house ->She is going to buy that house