3 sentences

1. 医生明天要给病人开刀。

   yī​shēng míng​tiān yào gěi bìng​rén kāi​dāo.

   The doctor is going to operate on the patient tomorrow.

   Source: Dong Chinese Dictionary

2. 经理决定先从迟到的人开刀。

   jīng​lǐ jué​dìng xiān cóng chí​dào de rén kāi​dāo.

   The manager decided to make an example of those who arrive late first.

   Source: Dong Chinese Dictionary

3. 在古代，重犯常被拉到午门开刀。

   zài gǔ​dài, zhòng​fàn cháng bèi lā dào Wǔ​mén kāi​dāo.

   In ancient times, serious criminals were often executed at the Meridian Gate.

   Source: Dong Chinese Dictionary