3 sentences for 开工 (kāi​gōng — start production)

1. 祝你开工大吉，生意兴隆。

   zhù nǐ kāi​gōng dà​jí, shēng​yi xīng​lóng.

   I wish you a lucky start and a prosperous business.

   Source: Dong Chinese Dictionary

2. 我们开工吧。

   wǒ​men kāi​gōng ba.

   Let's get to work.

   Source: OpenSubtitles

3. 原材料已经到位，工厂下周就可以正式开工。

   yuán​cái​liào yǐ​jīng dào​wèi, gōng​chǎng xià zhōu jiù kě​yǐ zhèng​shì kāi​gōng.

   The raw materials have arrived, so the factory can officially start operations next week.

   Source: Dong Chinese Dictionary