3 sentences

1. 他现在是一名中士。

   tā xiàn​zài shì yī míng zhōng​shì.

   He is now a sergeant.

   Source: Dong Chinese Dictionary

2. 你确定他是个真正的中士吗？

   nǐ què​dìng tā shì gè zhēn​zhèng de zhōng​shì ma?

   Are you sure he's a real sergeant?

   Source: OpenSubtitles

3. 他在部队服役多年，现在是一名中士。

   tā zài bù​duì fú​yì duō nián, xiàn​zài shì yī míng zhōng​shì.

   He has served in the army for many years and is now a sergeant.

   Source: Dong Chinese Dictionary