In Chinese, the syllable 'bù' (fourth tone) undergoes tone sandhi and changes to second tone 'bú' when followed by another fourth tone syllable, as in 'bù xiè' (not polite) and 'bù yào' (don't want); however, it retains its fourth tone when followed by first, second, or third tone syllables, as in 'duì bù qǐ' (apologize) and 'bù kāixīn' (unhappy).
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How to Apologize in Chinese 🇨🇳Ajouté :
I'm sorry.
對不起。
You've noticed that we have many b u combination here. That syllable bù here is bú. And here we have bú.
So, one syllable, how come it has two different pronunciations?
Well, that's because tone sandhi.
The original sound of b u syllable is the fourth tone, bù.
It will change into the second tone when it follows with the fourth tone.
So, when it used with a fourth tone syllable together, we change bù into bú.
For example, bù xiè. Bù yào.
And when it goes with the first tone, the second tone, and the third tone, it remains the fourth tone.
For example, duìbùqǐ.
This is the third tone.
Bù kāixīn. Kāi is the first tone, so we just use it like bù.
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