It was during his classes that he had an epiphany.

正是在上课期间，他顿悟了。

What are you doing out of class?

你怎么没在上课？

The attack began early in the school day.

袭击发生在上课日早上。

In parts of Pennsylvania, class was in session on President's Day.

宾夕法尼总统日这一天也在上课。

She even checks it while in class.

她甚至在上课时检查过。

Why are you talking when you have a lesson?

你为什么要在上课时说话？

They want to find out about this country before the lessons.

在上课前，孩子们想先了解这个国家。

Most colleges require students to have certain vaccines before they can attend classes.

大多数大要求生在上课前接种特定疫苗。

Good learners often ask questions during or after class.

好习者经常在上课期间或者课下提问题。

Hey, Nick. Don't listen to music in class, Nick!

嘿，尼克。不要在上课时听音乐。

All students and teachers are required to wear masks during classes.

所有生和教师在上课时都必须佩戴口罩。

So I would just call in the Wednesday matinees 'cause I was in class.

所以我会在周三日场打电话，因为我在上课。

Donald is in class. He raises his hand to get the teacher's attention again.

唐纳德在上课。他再度举手吸引老师注意。

Most colleges require you to pay these costs before you can attend classes.

大多数大要求你在上课之前就支付这些费用。

He hasn't been able to teach Sunday school class which was very important to him.

他没能在主日校上课，在主日上课对他来说很重要。

Yes, he also said we would discuss it in class.

是，他还说在上课时要讨论一下。

I expect every minute to hear the school bell ring, said Andrew.

我还想在上课钟声响起之前到校呢。安德鲁说。

New York City schools are still open despite rising coronavirus rates.

尽管新冠病毒感染数量不断上升，纽约市校仍在上课。

Other students broke school rules by leaving in the middle of class to meet up with friends.

其他生违反校规，在上课期间逃课去见朋友。

A teacher had been much annoyed by some of his boys whistling during school hours.

从前，有一个老师，他很为生们在上课期间吹口哨所烦恼。