Придумать 8 предложений с любым модальным глаголам can или must

1. You must return there books to the library today.
2. Susan should leave really early tomorrow.
3. You must it's your duty to...
4. We can it's necessary to...
5. I must study more.
6. Can I close the window, please?
7. You must be careful when driving in the rain.
8. You can by tickets online.