Some students do not behave themselves in schools and they often do not attend classes or break school rules.
一些学生因此而无心学习，违反学校的规章制度。
The headmaster warns us not to break the school rules, or we'll be punished.
校长警告我们不要违反校规，否则我们将受到惩罚。
The students were told not to break any of the rules of the school.
学生们受到告诫， 不要违反校规。
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