1. The problem is too complex for you to deal with it alone.
2. He has a very good memory. He only needs to hear a word once, and he will remember it for the rest of his life.
3. He asked for books to be sent to him by mail.
4. They need to rest in order to be in good shape for competitions.
5. it's okay for You to say that I can do this job, but I'm not so sure.
6. The trip is too interesting to us to lose her.
7. They were waiting for their lunch to be served.
8. You don't need to work so hard and risk your health.
