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When writing 不客气 in (PinYin):

不 = Bù

不客气 = Bù kèqi

Because of the fourth tone of kè the pronunciation is Bú kèqi. But do i write it down as Bù kèqi or Bú kèqi?

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  • The particular tone, inflection used in this ubiquitous phrase, 不客气, (just like the English, "you're welcome"), depends also on the purported intent behind it. It could be a casual remark, a submissive answer or even some hidden sarcasm employed. – Wayne Cheah Feb 25 '20 at 4:53
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That depends on why you are writing it. The standard, normal way of writing it is to disregard the changed tone and write the original tone, i.e. bù kèqi. The same goes for tone changes of 一 (yī). Not showing the tone change is not a problem in this context, because the rules governing how to change the tones are quite simple. Since most Pinyin is written for native speakers, there's no need to include something which is obvious to the reader.

However, if your goal is to highlight this tone change, such as when teaching someone the language (someone for whom the tone changes are not obvious), it can sometimes make sense to write the actual tone for 不 and 一, so bú kèqi in your case, and yí yàng for 一样 or yì qǐ for 一起.

The third tone is (almost) always written as a third tone, though, as it would otherwise be impossible to know if a second tone is actually a second tone or a third tone that has changed. The only place where níhǎo would be acceptable for 你好 is in a discussion about third tone changes.

The problem of lost information does not apply to 不 and 一, so in teaching materials, changing the tone is usually a good idea (nothing lost; something gained). So, which one you choose depends on why you are writing it: If it's to teach someone pronunciation, then change the tones; if it's for something else, then leave the original tone!

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    Older materials may indicate tone sandhi with a hyphen, e.g.: bu4-2, but that’s hard to do with tone marks. – Mou某 Feb 24 '20 at 18:18

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