1. If we recycle, we will save natural resources.
2. If you don't hurry up, you will be late for work.
3. I asked him where he lived.
4. The examiner asked me what I had done to improve my English.
5. Peter said to Mary he would come with her as soon as he was ready.
6. John said he must stay at home that night to finish his homework.
7. Nam said to Hoa he would help her whenever she needed him.
8. Lan said to me I could use her telephone if I needed it.
9. The driver asked the passengers not to get off the bus while it was moving.
10. He said that he wishes he had known the answer.