Discussion of 一

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In the case where number "1" appears alone or when the speaker is giving a telephone number that contains "1", then the number will be spoken as "yao" in the first tone.

mex

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Thanks mex.

Shīya3

Thank you mex

Riah

Thanks so much!

KennethTan1345

Thanks Mex!

gymnasticsgeek

It’s Useful

David.J.I

Thanks Mex very useful

Brownbear

Thanks mex

hăi lún

Yeah it's very useful

BoscoSengSutDu

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Why won't you put a sentence to go with 一

qbt

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when does 一 change tones?

星星的心

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The tone of 一 (yī) changes to the second tone (yí) when it precedes a fourth tone (such as in the phrase 一下 yíxià).
The tone of 一 (yī) changes to the fourth tone (yì) When it precedes a first, second or third tone (such as in the phrases -- 一天 yìtiān 一碟yìdié，一晚 yìwǎn)

lisaC

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