My biology teacher, Mr. White, came to the classroom five minutes before the class began.
我的生物老师怀特先生在上课前五分钟来到了教室。
LL: I read the reading assignment just an hour before class began.
上课前一小时看看指定阅读些什么材料你就去上课啦！
I read the reading assignment just an hour before class began.
我在开课前一小时读过了要求阅读的那部分。
It is the teacher and parents' responsibility to replace the chairs and desks as they were found before class began.
上完课后，老师和家长应该负责把桌子椅子摆回原样。
It is the teacher and parents' responsibility to replace the chairs and desks as they were found before class began.
上完课后，老师和家长应该负责把桌子椅子摆回原样。
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