请在上课之前把你们的练习交上来。
在上课之前，小朋友们，我们猜个谜语，好不好？
约翰在上课之前大体浏览了一遍阅读作业。
在上课之前你必须写出教案，学校会定期检查。
You have to write teaching plans for every class. School will check them.
今天在学校里我急着在上课之前上厕所，就找了一幢不熟悉的建筑。
Today, I was in an unfamiliar building on campus and I needed to use the bathroom before class started.
阮风华不得不在上课之前进行自学，然后每天放学之后学习5个小时。
Ruan had to earn his teachings by applying himself before and after school for five hours everyday.
举个例说吧，有一天，在上课之前，他在黑板上写了一大串家庭作业题目，大家都以为是老师布置的作业。
For example, one day before class, he put a long homework assignment on the board and made us think that the teacher had given it.
应用课只适用于相应级别，且需要至少在上课之前15 分钟在前台预定。详情请咨询语言指导老师。
Tips: Applications are only available for the students of targeted level and should be booked at the reception 15 minutes in advance. For further information, please consult the tutors.
另外一些学校只要小学生们不在上课时间使用，允许他们携带手机入校。但是多数学校还是希望孩子们在每一堂课开始之前，把那些电子装备暂时存放在储物柜中或收好在袋子里。
Others allow pupils to carry phones if they do not use them during the school day, but most expect electronic equipment to be deposited in lockers or put in zipped bags at the start of each lesson.
在上课开始之前。
作业题组必须在上课结束之前，也就是缴交期限之前交出来。
Problem sets must be handed in by the end of the class in which they are due.
如果你不能在上课前完成或是准备好上课的讨论，请在24小时之前知会助教。
If you cannot make it to class or cannot prepare for the case discussion, please let the instructors know 24 hours in advance.
如果你不能在上课前完成或是准备好上课的讨论，请在24小时之前知会助教。
If you cannot make it to class or cannot prepare for the case discussion, please let the instructors know 24 hours in advance.
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