3 sentences

1. 我们寝室一共有四个人。

   wǒ​men qǐn​shì yī​gòng yǒu sì gè rén.

   There are four people in our dormitory.

   Source: Dong Chinese Dictionary

2. 要是你十分钟见不到我，打我寝室电话。

   yào​shi nǐ shí fēn​zhōng jiàn bù dào wǒ, dǎ wǒ qǐn​shì diàn​huà.

   If you don't see me in ten minutes, call my room.

   Source: OpenSubtitles

3. 宿管阿姨每天晚上十点准时到各个寝室查房。

   sù​guǎn ā​yí měi tiān wǎn​shang shí​diǎn zhǔn​shí dào gè gè qǐn​shì chá​fáng.

   The dormitory supervisor makes her rounds of the rooms at ten o'clock sharp every night.

   Source: Dong Chinese Dictionary