Have to

 Use have to.

1. Spotsmen  ___________ train hard.

2. My parents ___________ (not) do homework.

3. Liz's little sister  ___________ go to bed early.

4. My granny ___________ (not) work. He’s 71.

5. Students ___________ work hard at school.

6. My teacher ____________ work today.

7. I ____________(not) go to school on Sundays.

8. Helen __________ wash the dishes every day.

9. We ___________ (not) do our homework. It’s Saturday Tomorrow.

10. Singers ___________ (not) cut the grass.