你们离开教室前应该把它打扫干净。
请确保在你离开教室前关掉所有的灯。
Please make sure that all the lights are closed before you leave the classroom.
在离开教室前，我关上了所有的窗户。
我看见许多鸟在教室前飞过。
在你离开教室前要确保关掉所有的灯。
Make sure you turn off all the lights before you leave the classroom.
在你离开教室前请关好窗户。
老师经常提醒我们在离开教室前要关灯。
Teacher often reminds us to turn off the lights before we leave the classroom.
孩子进教室前要先排队。
Before the children would come into class they would line up.
离开教室前，请把灯关掉。
在离开教室前，请确认一下所有的灯都关了。
Before leaving the classroom, please make sure that all the lights are off.
有时，她进教室前要从口袋里取出镜子来照一下。
Sometimes, she would fish out a mirror from his pocket and look in it.
整个走廊里几乎没什么人乐，我站在法语教室的前。
Halls are almost empty. I'm standing in front of my French classroom. "Clare."
考试前，我们几个赶忙跑到书店把书卖了，随后，我们坐在教室里等着考试。
Before class, several of us dashed over to the store and sold our books.
看着这个我两个星期前在教室做的巧克力果馅饼使我很开心。
Looking at the chocolate tart we made in class 2 weeks ago makes me happy.
登出前应清理电脑桌面上的档案，切勿在教室之电脑中储存重要的档案。
Clear the desktop before you log out. Do not save important files in the computers.
我们必须7点前回到教室。
看见老师走进教室，他停下来开始做作业。(老师进来前，他在做别的事)。
He stopped to do his homework when he saw the teacher coming into the classroom.
如果你在5：00前不能完成打扫教室的任务，她会帮助你的。
She will help you if you can't finish cleaning the classroom before 5:00.
如果你在5：00前不能完成打扫教室的任务，她会帮助你的。
She will help you if you can't finish cleaning the classroom before 5:00.
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