- 难道...不成 nándào... bùchéng is it possible thatused in a rhetorical question to express disbelief or surprise
- 难道...吗 nándào... ma could it be thatused in rhetorical questions to emphasize disbelief or surprise
- 难道是 nándàoshì could it be thatcould it be that; used to introduce a rhetorical question in a state of disbelief or surprise