Dan's class know Dan is in the hall before they see him.
丹的同学还没见到他，就知道他在大厅里了。
Before class starts or at home, if you know what the lecture is on, try to read the chapter before class starts.
在课程开始之前或者是在家里，如果你知道这个课要讲什么，试着在课程开始之前看看这章的内容。
Be sure to let your instructor know about any orthopedic problems or special needs you may have before the class begins.
确信你的教练知道你的整体状况，或是一些特殊需要。
I know that if he doesn't do his homework before his karate class, it's not going to get done because by the time we get home from his karate class he's too tired.
我知道如果空手道课前他不做家庭作业，作业就完成不了，因为到我们从他的空手道课回来后，他太累了。
Butt before you get too excited, you need to know that it was for a class called The Archaeology of Food.
但是在你过于兴奋之前，你需要知道，这是一堂《食物考古学》课程的要求。
Before class I have not too confident, know the answer but afraid of making mistakes, dare not raise their hands to speak, through this event, I top teacher remain free, always full of confidence.
以前我上课总有点不太自信，明明知道答案却怕出错，不敢举手发言，通过这件事后，我上方老师的课无拘无束，总是信心满满的。
Before we know that the class was over.
之前我们知道下课。
Before we know that the class was over.
之前我们知道下课。
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