GbEng
那些男孩子们渴望下课。 The boys were itching for the lesson to end.
下课铃响了. There's the bell for the end of the lesson.
下课后,班长把练习册收了起来。 The monitor collected the exercise books after the class was over.
老师要他下课後先别走. The teacher told him to stay behind after class.