时好时坏的英文

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。