2 отрицательных предложения с must,
2 отрицательных предложения с should
2 вопросительных предложения с must
2 вопросительных предложений с should
1 утвердительное предложение с must
1 утвердительное с should

pupils musn't chew gum during lessons.
you musn't forget to follow the school rules.
you shouldn't be late for your lessons.
she told him that he shouldn't be nervous about meeting new people.

learn the school rules and you'l know what you must and musn't do.
you should make sure you know your new school.