1. I have to clean my flat.
2. You have to do your homework by yourself.
3. She has to return my book.
4. He has to wait for her.
5. We have to do this work.
6. You have to know him.
7. They have to pass the exam.
8. Unfortunately, I have to go now.
9. You have to study well.
10. I have to repair my car.