3 sentences

1. 他在学生会担任会长。

   tā zài xué​sheng​huì dān​rèn huì​zhǎng.

   He serves as the president of the student union.

   Source: Dong Chinese Dictionary

2. 她不是会长的亲生母亲。

   tā bù shì huì​zhǎng de qīn​shēng mǔ​qīn.

   She's not the chairman's biological mother.

   Source: OpenSubtitles

3. 会长是谁？

   huì​zhǎng shì shéi?

   Who's the president?

   Source: OpenSubtitles