Subject + 坏 + 了
坏 (huài) is an adjective meaning "bad," "broken," or "spoiled." It can describe moral badness (a bad person), physical damage (broken equipment), or food that has gone off. When used as a resultative complement after a verb, it indicates that something has been ruined or damaged.
这个苹果放太久了,已经坏了。
zhège píngguǒ fàng tài jiǔ le, yǐjīng huài le.
This apple has been left too long and has already gone bad.
他不是坏人,只是脾气不太好。
tā bú shì huàirén, zhǐshì píqi bú tài hǎo.
He's not a bad person; he just has a bit of a temper.
我的手机屏幕摔坏了,得去修一下。
wǒ de shǒujī píngmù shuāi huài le, děi qù xiū yíxià.
My phone screen cracked from a fall — I need to get it repaired.