上课:attend class.
例句:
许多孩子在大班上课时学习效果不好。
Many children can't function effectively in large classes.
星期一是公共假日,所以学校不上课。
The school will be closed Monday because it's a holiday.
没有强求学生上课。
There are no compulsions on students to attend classes.
全班安静下来她便开始上课了。
The class settled down and she began the lesson.
老师警告说,如果他们上课时继续使用手机就予以没收。
The teacher threatened to confiscate their phones if they kept using them in class.