上课的英文：
attend class

参考例句：

You should be serious in class. Don't behave in a noisy, gay, and boisterous manner.
你上课要严肃，不准嬉皮笑脸。

Free trial lessons, low cost, small classes, group or private instruction, friendly atmosphere
免费试读,学费便宜,小班上课,分组练习个别辅导,学习气氛浓厚

Let us proceed with our lesson.
我们开始上课吧。

He is very attentive in class
他上课用心听讲。

He had to discontinue taking lessons.
他不得不中断上课。

It's time for class.
上课时间到了

All talking is barred during a classes.
上课时间禁止说话。

Were you in class on Wednesday?
你星期三上课了吗?

He is very attentive in class.
他上课用心听讲。

Class begins. Good morning, children.
开始上课。孩子们，早上好。

attend是什么意思：
v. 出席，参加；上（大学等）；照料；致力于；伴随

Attendance is obligatory.
出席是必须的。

in attendance on a person
随侍 [服侍] 某人

Everybody consciously attends to things and everything is attended to
人人自觉管,事事有人管。

May good fortune attend you!
祝你鸿运当头！

Few students attended the meeting.
没几个学生出席会议。

class是什么意思：
n. 班级；阶级；种类
v. 分类；把…分等级
adj. 很好的

It is a step class.
这是踏板操训练班。

The class dismissed.
下课了。

The class teacher sectioned the class for dialogues.
老师把班级分组进行对话练习。

The class teacher dismissed the class on time.
教师按时下课。

A second - class letter is slower than a first - class.
二类信比一类信件慢。