3 sentences for 认错 (rèn​cuò — apologize)

1. 您就认错吧。

   nín jiù rèn​cuò ba.

   Just admit your mistake.

   Source: OpenSubtitles

2. 既然你已经认错了，就没必要再辩了。

   jì​rán nǐ yǐ​jīng rèn​cuò le, jiù méi bì​yào zài biàn le.

   Since you've already admitted your mistake, there's no need to argue further.

   Source: Dong Chinese Dictionary

3. 他意识到自己不对，主动向老师认错了。

   tā yì​shí dào zì​jǐ bù duì, zhǔ​dòng xiàng lǎo​shī rèn​cuò le.

   Realizing he was in the wrong, he took the initiative to apologize to the teacher.

   Source: Dong Chinese Dictionary