3 sentences

1. 他在医院伺候生病的母亲。

   tā zài yī​yuàn cì​hou shēng​bìng de mǔ​qīn.

   He is looking after his sick mother in the hospital.

   Source: Dong Chinese Dictionary

2. 他在星期六的晚上伺机作案。

   tā zài Xīng​qī​liù de wǎn​shang sì​jī zuò'àn.

   He waited for an opportunity to commit a crime on Saturday night.

   Source: Dong Chinese Dictionary

3. 以前的大户人家有很多家人伺候。

   yǐ​qián de dà​hù​rén​jiā yǒu hěn​duō jiā​rén cì​hou.

   In the past, wealthy families had many servants to wait on them.

   Source: Dong Chinese Dictionary