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1.（教师）听课：Observe a/the class
You may also want to sit in and observe the class that interests you.
你也可以找个地方坐下，仔细看看你感兴趣的课程。
observe the class （教师）听课
2.点名：call the roll/register
Morning, everyone. I'll call the roll before class. Lucy?
大家早上好。上课之前我点一下名。露西在吗？
3.上班打卡：clock in
下班打卡：clock out
I have to clock in by eight.
我必须八点前打卡上班。
clock in 打卡上班
4.全体起立：all rise
Would you all rise, please, to welcome our visiting speaker.
请大家起立，欢迎我们的演讲嘉宾。
5.仔细听：Listen up
Listen up, class. We will have a spring outing this Saturday.
同学们，请注意听。我们这个星期六要去春游。
