《国立历史语言研究.中央研究院》the_tones_of_four_tai_dialects_国立中央研究院历史语言研究所集刊
TheTonesofFour TaiDialects 2Withineachofthefour tonecategoriestheactual tonaldevelopment ineach dialect is conditioned by thenature(historically speaking)of initial consonatProto-Tai is assumed to have had two major consonant classes, voiceless and voiced,numbered 1 and 2,respectively,by Li.?
D(L) 1H1M2 X X D(L) 2 2 1 Thisisdiscussed D(S) 1H1M X X X D(S) 2 1 C 1M 1H 2 X C 1H 2 1M Chart3.Nakhonsithammarat.B 1M X X ChartRoi-et.B 1M 1H X X 3Ascanbe seenfrom a study ofthe chartsgiven above,theProto- Tai dualsystemof tone categoriesand consonant classesis reflectedin all ofthedialects.
TheTones ofFour TaiDialects The five actual tones of Siamese are thus the result of the following combinations: A-1H A-1M and A-2 B-1 B-2 and C-1 C-2 43Althoughboth theNakhonsithammarat and theRoi-etdialectshave seven actual tones,theline of development has been quite different inthe 
