You went home as soon as the class was over. I'm afraid if there is something wrong with your family.
这些天你一下课就匆忙回家。是不是家里发生什么事啊？我有点担心，所以打电话问问你。
Your homework must be handed in before the class is over.
你们的作业必须在下课之前交上来。
Hand in your papers by the time class is over.
下课时，必须把试卷交上来。
Hand in your papers by the time class is over.
下课时，必须把试卷交上来。
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