We were having classes all that day.
那天我们整天都在上课。
It's nine o 'clock. We are having classes.
现在是九点钟，我们正在上课。
They went to the park instead of having classes.
他们去公园了，而没有上课。
In school, except having classes, I spend most of the time doing homework.
在学校，除了上课，我大部分时间都花在做作业上。
In school, except having classes, I spend most of the time doing homework.
在学校，除了上课，我大部分时间都花在做作业上。
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