在上课期间，请保持安静。

Please remain quiet at school.

我们每天早上八点开始在上课。

We start at school every morning at eight.

在上课时，他总是很认真。

He is always very attentive at school.

她喜欢在上课时坐在前排。

She likes to sit in the front row at school.

他现在在上课，不能接电话。

He is currently at school and cannot take the call.

值日起初；开始最后在上课，在上学此刻在家；无拘束现在上班，在工作同时

At at first at last at school at the moment at home at present at work at the same time on on duty

学校禁止在上课期间使用手机。

The school bans the use of mobile phones during classes.

学校限制在上课时间使用手机。

The school restricts the use of mobile phones during class hours.

我们需要在上课前读课文。

We need to read the text before class.

你不应该在上课时打瞌睡。

You shouldn't doze off during class.