我们还有半个小时就下课了。

We will finish class in half an hour.

对，我们该下课了。

Right, we should finish class now.

我一下课就马上去图书馆。

I'm going to the library straight after the class.

下课铃响了。

The bell sounded for the end of the class.

这个书包是有人下课后落下的。

This bag was left behind after the class.

12点下课了。

At 12 o'clock the class was dismissed.

下课后来见我。

See me after class.

如果你在黑板上写字，下课时要擦掉。

If you write on the blackboard, rub it off at the end of the lesson.

老师要他下课后留下来。

The teacher told him to stay behind after class.

下课以后我们一起回家。

Let's go home together after class ( is over).

还有10分钟就下课了。

Class will be over in ten minutes.

快下课了。

The class will be over soon.