求翻译：If I were late for school, I would clean the classroom after school, and I would promise to the head teacher that I would not be late again. If I were absent from school, I would ask for a leave first. But if not, I would be punished for skipping the class. When I come back to school , I would explain to the teacher the reason why I had been late and I would write a letter of guarantee.是什么意思？

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