3 sentences

1. 新大楼将于下周正式动工。

   xīn dà​lóu jiāng yú xià zhōu zhèng​shì dòng​gōng.

   Construction on the new building will officially start next week.

   Source: Dong Chinese Dictionary

2. 这个方案已经有了眉目，我们很快就能动工。

   zhè​gè fāng'àn yǐ​jīng yǒu le méi​mù, wǒ​men hěn kuài jiù néng dòng​gōng.

   The plan has begun to take shape; we can start work soon.

   Source: Dong Chinese Dictionary

3. 工程师在动工前对建筑场地进行了详细的勘察。

   gōng​chéng​shī zài dòng​gōng qián duì jiàn​zhù chǎng​dì jìn​xíng le xiáng​xì de kān​chá.

   The engineer conducted a detailed survey of the building site before construction began.

   Source: Dong Chinese Dictionary