2 sentences for 歉 (qiàn — to regret)

1. 他在信中表示歉意。

   tā zài xìn zhōng biǎo​shì qiàn​yì.

   He apologized in the letter.

   Source: CCMatrix

2. 我为我女儿的行为表示歉意。

   wǒ wèi wǒ nǚ'ér de xíng​wéi biǎo​shì qiàn​yì.

   I apologize for my daughter's behavior.

   Source: OpenSubtitles