时好时坏的英文

My feeling like the weather outside, which is when the good and bad (volatile). "时好时坏"when the good and bad "Volatile"是“易变的”意思。也可解释为“阴晴不定”。也可为"which is volatile."

have changing moods, now gay, now gloomy

Sometimes good,but sometimes bad.你可以说Just so so 了

I'm in bad mood

直接sometimes good sometimes bad.就行

my mood just like the weather,which is good or bad from time to time.

最简单的表达就是： be in-and-out，或 run in fits ans starts.这是机器设备也可以用：tentative 来描述其性能。