"have to"后面需要加 动词原形。例如：
1. I have to tidy my room.
2. She has to help with the washing.
3. I have to finish my homework tonight.
4. They have to attend the meeting.
5. Mr. Johnson has to work very hard to earn a living.
6. I had to leave the party early.
7. Nick doesn't have to wear a uniform.
8. Do you have to stay at home on weekends？