2 sentences

1. 请你把这件事知会他一声。

   qǐng nǐ bǎ zhè jiàn shì zhī​huì tā yī shēng.

   Please notify him of this matter.

   Source: Dong Chinese Dictionary

2. 我们还没收到有关部门的正式知会。

   wǒ​men hái méi shōu​dào yǒu​guān bù​mén de zhèng​shì zhī​huì.

   We haven't received a formal notification from the relevant departments yet.

   Source: Dong Chinese Dictionary