5 sentences for 公事 (gōng​shì — official business)

1. 我们今天只谈公事，不谈私事。

   wǒ​men jīn​tiān zhǐ tán gōng​shì, bù tán sī​shì.

   Today we will only talk about business, not personal matters.

   Source: Dong Chinese Dictionary

2. 我们今天不谈私事，只论公事。

   wǒ​men jīn​tiān bù tán sī​shì, zhǐ lùn gōng​shì.

   We are not talking about private matters today, only official business.

   Source: Dong Chinese Dictionary

3. 处理公事时，不应该感情用事。

   chǔ​lǐ gōng​shì shí, bù yīng​gāi gǎn​qíng​yòng​shì.

   When handling official business, one should not be swayed by emotions.

   Source: Dong Chinese Dictionary

4. 这件公事由他当事，处理得十分稳妥。

   zhè jiàn gōng​shì yóu tā dāng​shì, chǔ​lǐ de shí​fēn wěn​tuǒ.

   He was in charge of this official matter, and it was handled very reliably.

   Source: Dong Chinese Dictionary

5. 这次面试对他来说只是例行公事，因为职位已经定好了。

   zhè cì miàn​shì duì tā lái shuō zhǐ shì lì​xíng gōng​shì, yīn​wèi zhí​wèi yǐ​jīng dìng​hǎo le.

   This interview was just a formality for him, as the position had already been decided.

   Source: Dong Chinese Dictionary