4 sentences

1. 我的球童是见证人。

   wǒ​de qiú​tóng shì jiàn​zhèng​rén.

   My caddie was a witness.

   Source: CCMatrix

2. 我要你当个见证人。

   wǒ yào nǐ dāng ge jiàn​zhèng​rén.

   I want you to be a witness.

   Source: CCMatrix

3. 我们有一个见证人。

   wǒ​men yǒu yī​ge jiàn​zhèng​rén.

   We have a witness.

   Source: OpenSubtitles

4. 他并不是见证人。

   tā bìng​bù​shì jiàn​zhèng​rén.

   He’s not a witness.

   Source: CCMatrix