We were having a lesson about Chinese culture at this time yesterday.
昨天这个时候我们正在上一节关于中国文化的课。
他们正在上一节课。
They are not having a lesson. They are cleaning the classroom.
他们不是在上课，而是在打扫教室。
But they are not having a lesson. They're studying by themselves.
他们不是在上课，而是在自学。
But they are not having a lesson. They're studying by themselves.
他们不是在上课，而是在自学。
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