“上课”和“下课”用英语怎么说？

老师：上课class begins
学生：早上好good morning（Good afternoon）teacher
老师：下课class over
学生：再见goodbye teacher

class begins 上课 class over 下课 老师说
stand up 班长说
good morning 上午好 good afternoon 学生

class begins

class is over

“上课”class begins

“下课”class over

class begins.class over.