4 sentences for 作 (zuò — act as)

1. 他在这出戏里作主角。

   tā zài zhè chū xì lǐ zuò zhǔ​jué.

   He plays the lead role in this play.

   Source: Dong Chinese Dictionary

2. 人民必须作见证。

   rén​mín bì​xū zuò jiàn​zhèng.

   The people must bear witness.

   Source: OpenSubtitles

3. 乙醇常用作实验室里的溶剂。

   yǐ​chún cháng​yòng zuò shí​yàn​shì lǐ de róng​jì.

   Ethanol is commonly used as a solvent in laboratories.

   Source: Dong Chinese Dictionary

4. 他两步并作一步，飞快地跑上了楼梯。

   tā liǎng bù bìng zuò yī bù, fēi​kuài de pǎo shàng le lóu​tī.

   He took the stairs two at a time and ran up quickly.

   Source: Dong Chinese Dictionary