4 sentences

1. 我知道开挖的事。

   wǒ zhī​dào kāi​wā de shì.

   I know about the dig.

   Source: OpenSubtitles

2. 工人正在开挖地基以准备打桩。

   gōng​rén zhèng​zài kāi​wā dì​jī yǐ zhǔn​bèi dǎ​zhuāng.

   Workers are excavating the foundation in preparation for piling.

   Source: Dong Chinese Dictionary

3. 该运河工程预计将于下周正式开挖。

   gāi yùn​hé gōng​chéng yù​jì jiāng yú xià zhōu zhèng​shì kāi​wā.

   Excavation for the canal project is expected to begin next week.

   Source: Dong Chinese Dictionary

4. 在开挖地面之前，必须先核实地下管线的位置。

   zài kāi​wā dì​miàn zhī​qián, bì​xū xiān hé​shí dì​xià guǎn​xiàn de wèi​zhi.

   Before excavating the ground, the location of underground pipelines must be verified.

   Source: Dong Chinese Dictionary