Meaning of wèi shén me:
wèi shén me
为什么
Pronoun
why?; for what reason?
Nǐ zhīdào tāmen wèishénme chídào ma?
你知道他们为什么迟到吗?
Do you know why they were late?
Nǐ néng gàosu wǒ wèishénme nǐ jīntiān méi lái ma?
你能告诉我为什么你今天没来吗?
Can you tell me why you didn't come today?