开会的时候，不可以吃东西。

Kāihuì de shíhou, bù kěyǐ chī dōngxi.

While you're having a meeting, you can't eat.

我今天特别生气，因为我的员工今天开会迟到了，而且还没有写完报告。

Wǒ jīntiān tèbié shēngqì, yīnwèi wǒde yuángōng jīntiān kāihuì chídào le, érqiě hái méiyǒu xiěwán bàogào.

I am super mad today because my employee was late to the meeting. On top of that, he didn't finish writing his paper.

老师现在很忙，他在开会。

Lǎoshī xiànzài hěn máng, tā zài kāihuì.

The teacher is very busy now; he is in a meeting.