不成bùchéng 1.same as不行{bùxíng}①②。 2.〈助词aux.〉用在句末,表示推测或反问的语气,前面常常有‘难道、莫非’等词相呼应{[attached to the end of a sentence to indicate inference or a rhetorical question, usu. preceded by 难道nándào or 莫非mòfēi]}: 难道就这样算了～?{How can we let it go like that?}|他还不来,莫非家里出了什么事～?{He hasn't come yet. Something wrong in his family?}?D