Помогите мне пожалуйста. Надобно написать школьные верховодила и там должно быть

Во-первых must и must not.
1) You mast do your homework
2) You mustnt make noise
3) You must listen to your teacher
4) you mustnt talk to your classmates on the lesson
5) You mustnt use your mobile phone on the lessons
6) you must study hard
7) you must wear a school uniform
8) You must come to school on time