We do morning exercises before classes begin.
上课前我们做早操。
He has to get up before 7:10 and go for a run before classes begin.
他不得不在7：10前起床，然后在课前晨跑。
[2008-07-23 16:41]--Teenagers need nine hours of sleep a night and parents can help by getting them back on a school sleep schedule before classes begin, researchers suggest.
研究人员日前指出，中学生每天需要九个小时的睡眠，在开学之前，家长们要帮助孩子逐渐回到上学时的作息时间上来。
The morning classes begin at 8.
上午的课八点钟开始。
下午课开始。
You are required to purchase the readings before classes begin.
上课之前，你必须购买阅读材料。
Then I usually have breakfast before 8 cause classes begin at 8.
然后在八点前吃早饭，因为第一节课都是八点开始的。
Knowing that new students will arrive on campus a little bit early, I send them an email the week before classes begin.
确信新生们将稍微早一点到校，我在开课一周前给他们发了一封电子邮件。
明天将重新开课。
Classes begin at nine fifteen.
九点十五分上课。
Classes begin at half past eight.
八点半开始上课。
Classes begin at half past eight.
课在八点半开始。
八点开始上课。
八点钟开始课程。
Classes begin as early as 6 am with instructors in urban-camo pants yelling out drill-like commands in the traditional bootcamp style.
训练营一般是早上6点开始上课，教官们身穿都市迷彩服，大喊训练口令，和传统的训练营差不多。
Classes begin as early as 6 am with instructors in urban-camo pants yelling out drill-like commands in the traditional bootcamp style.
训练营一般是早上6点开始上课，教官们身穿都市迷彩服，大喊训练口令，和传统的训练营差不多。
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