Statement/Question + 呢
The particle 呢 (ne) can be used at the end of a question to add a rhetorical or challenging tone, suggesting that the speaker already suspects the answer or finds the situation surprising. In this usage, it often appears in questions with 为什么 or other question words, giving the sentence a tone of disbelief or challenge. It invites the listener to reconsider their assumption.
他自己都没做到,凭什么说别人呢?
tā zìjǐ dōu méi zuòdào, píng shénme shuō biérén ne?
He hasn't even managed to do it himself — what right does he have to criticize others?
你不是说不去吗,怎么又改主意了呢?
nǐ bú shì shuō bú qù ma, zěnme yòu gǎi zhǔyì le ne?
Didn't you say you weren't going? Why did you change your mind?
这么简单的事情,为什么做不好呢?
zhème jiǎndān de shìqíng, wèishénme zuò bù hǎo ne?
Why can't you do such a simple thing well?