The origins of Kra-Dai tones, current status III: tone A

In two recent posts I discussed the origins of the Kra-Dai tones C (here) and B (here). Here I discuss tone A.

Kra-Dai A-category words correspond primarily to Austronesian words ending in sonorants (vowels, semi-vowels, nasals, liquids). This was already pointed out by Ostapirat (2005). Examples:


Buyang (Li 1999)






ma0 ta54 < A1

*ata A

*p.taː A




ma0 ðu312 < A2

*aRu A





tu312 < A2

*ʔtu A




bear (n.)

ta0312 < A2

*mui A

*ʰmwɯj A



to kill

ma054 < A1






pui54 < A1

*api A

*wɤj A




ʔdaːn31 < A1°

*ɲa:n A

*ɓlɯən A




nam54 < A1

*(ə)num A




to eat

ka:n54 < A1


*kɯɲ A



Note that the numerals in the Tai branch are Chinese loanwords.

A second source of Kra-Dai category-A words is in PAN *-H2 (see: LINK for Tsuchida’s *-H2)


Buyang (Li 1999)






qa0 tu54 < A1

*utu A

*traw A



ear ta0 ða312 < A2 *ilai A *krwɯː A *CaliŋaH2 or *CaŋilaH2 *taliŋah
three tu54 < A1

*utu C !


*tu-tuluH2 *tu-tuluh

Tone C in the Hlai word for ‘three’ may be the result of list analogy: it is part of a series of four consecutive numerals in tone C: *cɨ C ‘one’, *alau C ‘two’, *utu C ‘three’, *atəu C ‘four’.

To recapitulate, these sources are found for the Kra-Dai tone categories:

Tone A (this post): AN words ending in sonorants (vowels, semi-vowels, liquids, nasals); PAN words ending in *H2.

Tone B (here): PAN words ending in *-R [ʁ]; other PAN-related B-category words are believed to have had *-X [χ].

Tone C (here): PAN words ending in *H1 [h]; at least one other source, possibly *-x (‘excrement’).

The probable phonetic values of these categories in Proto-Kra-Dai wer:

Category A: ending in vowels, semi-vowels, liquids, nasals;

Category B: ending *-X;

Category C: ending in *-h.

By the time of contatct with Chinese, beginning c. 200 BCE, final *-h had changed to a glottal stop.


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Sagart, Laurent. 2008. the expansion of setaria farmers in east asia: a linguistic and archaeological model. In Sanchez-Mazas A, Blench R, Ross M, Peiros I, Lin M, eds. Past human migrations in East Asia: matching archaeology, linguistics and genetics, 133-157. Routledge Studies in the Early History of Asia, London: Routledge.

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Cite this post as: Laurent Sagart, "The origins of Kra-Dai tones, current status III: tone A," in Sino-Tibetan-Austronesian, 20/11/2017,

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