任何 / 什么 + 事
The noun 事 (shì) means 'matter,' 'affair,' or 'thing.' It is a general-purpose noun for referring to events, tasks, or issues. It appears in many common expressions such as 没事 (it's nothing), 事情 (matter/affair), and 做事 (to do things).
别担心,没什么大事。
bié dānxīn, méi shénme dà shì.
Don't worry, it's nothing serious.
你今天有什么重要的事吗?
nǐ jīntiān yǒu shénme zhòngyào de shì ma?
Do you have anything important today?
这件事我已经处理好了。
zhè jiàn shì wǒ yǐjīng chǔlǐ hǎo le.
I've already taken care of this matter.