老板正在开会。

Lǎobǎn zhèngzài kāihuì.

The boss is in a meeting.

学生们正在进行考试。

Xuéshēngmen zhèngzài jìnxíng kǎoshì.

The students are taking the exam.

老师正在和校长谈话。

Lǎoshī zhèngzài hé xiàozhǎng tánhuà.

The teacher is discussing with the principal.