3 sentences for 变 (biàn — rebellion)

1. 丁此大变，他一夜白头。

   dīng cǐ dà biàn, tā yī yè bái​tóu.

   Due to this great change, his hair turned white overnight.

   Source: Dong Chinese Dictionary

2. 情况有变。

   qíng​kuàng yǒu biàn.

   The situation has changed.

   Source: OpenSubtitles

3. 一旦京城有变，你一定要立刻护送王妃离开。

   yī​dàn jīng​chéng yǒu biàn, nǐ yī​dìng yào lì​kè hù​sòng wáng​fēi lí​kāi.

   If anything happens in the capital, you must escort the princess out immediately.

   Source: Dong Chinese Dictionary