You should not be absent from class.

许多学生缺席，特别是连班长也没来。

I was happy to be absent from school.

上学缺课我可真高兴。

We can't afford to be absent from class again.

我们再缺课的话就有麻烦了。

A good student would not be absent from classes.

好学生是不会旷课的。

It is a pity that you (should) be absent from the meeting.

你居然没参加会议，真是可惜。