2 sentences

1. 他脾气反复无常。

   tā pí​qi fǎn​fù​wú​cháng.

   He has a volatile temper.

   Source: AI Challenger 2017

2. 你有时候就是太喜怒无常了，你知道吗？

   nǐ yǒu shí​hou jiù​shì tài xǐ​nù​wú​cháng le, nǐ zhī​dao ma?

   You're just too moody sometimes, you know that?

   Source: OpenSubtitles