现在是九点钟，我们正在上课。

It's nine o 'clock. We are having classes.

youdao

我们正在上课，这时发生了地震。

We were having class when the earthquake broke out.

youdao

正在上课的这位女老师也是一位阿姨。

The female teacher, who was giving her class a lesson was also an aunt.

youdao

他现在正在上课。

He is at school now.

youdao

他现在正在上课。

He is at school now.

youdao