怎么回事？(Zěnme huí shì?)What’s up; what happened?

Explanation

“怎么回事”（1）问发生了什么，有关心、询问的意思；（2）如果带有语气词，如“啊”“呀”等，就有了责问的意味。
“怎么回事”is to ask what has happened with concern. If it is followed by mood word like “啊”“ 呀”, it is accusatorial.
Words:

住院zhùyuàn:in the hospital;

昨天zuótiān:yesterday.

Sentences

1、Jiă: XiǎoZhāng jīntiān qǐngjià zhùyuàn le.
甲：小张今天请假住院了。
A: Xiao Zhang is ill in the hospital.

Yǐ: Zěnme huí shì? Zuótiān búshì hái hǎohaode ma?
乙：怎么回事？昨天不是还好好的吗？
B: What’s the matter? He was fine yesterday, wasn’t he?

2、Jiă: Zhè cì kǎoshì wǒ yòu méi tōngguò.
甲：这次考试我又没通过。
A: I failed the exam again this time.

Yǐ: Nǐ zěnme huí shì a , měicì dōu tōng bù guò.
乙：你怎么回事啊，每次都通不过。
B: What’s wrong with you? Why did you fail every time?