I have classes all the time!

我一直都在上课！

youdao

I have classes tomorrow morning.

明天上午我有课。

youdao

I have English classes and Chinese classes.

我有英语课和语文课。

youdao

I'm not sure whether we'll use the Classes server to have you sign up for discussion sections online, or whether we will do it the old-fashioned way and have you sign up on forms that we'll give you here in class.

我还没想要是用校网站,让大家在线讨论，还是用传统的,课堂讨论。

耶鲁公开课 - 新约课程节选

This was even longer than that. But also I would have to write this thing for one of the classes,

去年那段时间比高中的学习时间还长。而且我们还要写一些东西，

耶鲁的忙碌生活 - SpeakingMax英语口语达人

Be honest I mean, I wish I had, or if I was going to go in another field I wish I have taken more environmental science classes.

说实在的，真的是这样，如果我工作的是另一个领域的话,我希望上更多的环境科学课。

斯坦福公开课 - 微软CEO-Steve.Ballmer谈科技的未来课程节选

Whenever I have taught classes on corporate social responsibility ( CSR) in U.S. business schools, students seem invariably to focus on two key rationales for the development and propagation of CSR programs: their economic value in terms of tax incentives and their usefulness as marketing tools.

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No, but I have taken many local classes.

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Because I had dropped out and didn't have to take the normal classes, I decided to take a calligraphy class to learn how to do this.

WSJ: Steve Jobs: 'Find What You Love'