2. My brother has to do the washing up every day.
3. We have to clean our classroom once a week
4. To be a doctor you have to study for about six years
5. You have to be seventeen to drive in Britain.
6.We sometimes have to use calculators in mathematics classes.
7. My mother has to leave the house every morning at 6.30.
8. this party has to end at midnight because we have to get up early tomorrow