Discussion of 对不起，我听不懂。/對不起，我聽不懂。

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Why is the bu written once with a neutral and the other time with fourth tone?

bekat

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Hi! 对不起 is a set phrase and the pronunciation of 不 is fixed to be the neutral tone.
The second 不 in 听不懂 can be marked as the forth tone or the neutral tone -- both are correct. You may hear both in spoken Chinese.

lisaC

Hi 不 means "no" when someone asks a question. 我不是 means "No, I am not". But 对不起 means "I am sorry".

Kate Kitty

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