start or starts?

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1. We school at 7:45.
2. At our school lessons at 7:45.
3. School at 7:45.
4. Every day we must at 7:45.
5. Usually lessons at 7:45.
6. German pupils school before 8 o'clock.
7. My sister school at quarter to eight.
8. In England school at nine o'clock.
9. My brother must school at half past seven.
10. Usually the first lesson doesn't before 7:45.
11. The first lesson never before 7:30.