请在上课之前把你们的练习交上来。

Please pass up your exercises before class.

youdao

在上课之前，小朋友们，我们猜个谜语，好不好？

Kiddies, let's guess a riddle before our class, OK?

youdao

约翰在上课之前大体浏览了一遍阅读作业。

John scanned the reading assignment briefly before class.

youdao

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.

youdao

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.

youdao

在上课开始之前。

Before the class would start.

youdao

在上课开始之前。

Before the class would start.

youdao