怎么回事

zěn me huí shì

what's the matter?

what's going on?; how could that be?; how did that come about?; what's it all about?

怎

zěn

how

么

me

suffix, used to form interrogative 什麼|什么[shen2 me5], what?, indefinite 這麼|这么[zhe4 me5] thus, etc

回

huí

variant of 迴|回[hui2]

事

shì

matter