have class 为什么class前不加冠词?

问题描述:

have class 为什么class前不加冠词?
例如:I am having class.
既没有,a,也没the.

只表示”上课“这个概念class前面不用修饰语.
当表示上一堂什么(英语/汉语/数学/物理)课时要用冠词.
1.We have class at eight in the moring.
2.We had a English/Chinese class just now.
3.Do you have class this afternoon?
你今天下午有课吗?
4.Eileen:I have class this afternoon.
艾琳:我今天下午有课.