老师上课从不迟到。

The teacher never arrives late for the lesson.

您的儿子跟那一位老师上课？

Which teacher was your son having a lesson with?

我们历史老师上课总是泛泛而谈.

Our history teacher is always generalizing.

一些老师上课像打保龄球，而其他老师像打网球。

Some teachers give their lessons like playing bowling while others teach their students like playing tennis.

同学们正全神贯注、专心致志地听老师上课。

The students are preoccupied, committed to listen to the teacher.

我的数学比较差。因为我听不明白老师上课讲什么。

My maths is just a mess. I can't understand what the teacher is talking about.

学生不参加庆典，但是校长邀请了所有的老师，所以学生们因为没有老师上课而被迫放假。

The students were not involved in the celebration, but the schoolmaster invited all the teachers so students had to have holiday because of no teacher.

因为我的老师上课非常生动、有趣，所以我喜欢所有课程。

I like all the classes for my teachers can make the classes lively and interesting.

翻译他蹦蹦跳跳地跑回家，告诉他妈妈老师上课表扬他了。

He bounded back home to tell his mother that the teacher praised him in class.

预备铃响后，坐在位置上作好课前准备，静候老师上课。

The preparatory bell for class has already sounded.