Nǐ zěnme yòu chídào le?
你怎么又迟到了?
Why are you late again?
Notes:
你(nǐ): you
怎么(zěnme): why
又(yòu): again
迟到(chídào): be late
了(le): particle word
Example:
A:你怎么又迟到了?
Nǐ zěnme yòu chídào le?
Why are you late again?
B:对不起。
Duì bù qǐ.
I'm sorry.