4 sentences

1. 我为什么要惭愧啊？

   wǒ wèi​shén​me yào cán​kuì a?

   Why should I feel ashamed?

   Source: OpenSubtitles

2. 你应该感到惭愧。

   nǐ yīng​gāi gǎn​dào cán​kuì.

   You should be ashamed of yourself.

   Source: OpenSubtitles

3. ‎你觉得很惭愧吧？

   ‎ nǐ jué​de hěn cán​kuì ba?

   You're ashamed of yourself, right?

   Source: OpenSubtitles

4. 没能按时完成任务，我感到很惭愧。

   méi néng àn​shí wán​chéng rèn​wu, wǒ gǎn​dào hěn cán​kuì.

   I feel ashamed that I couldn't complete the task on time.

   Source: Dong Chinese Dictionary