The negative mo(莫)in Archaic Chinese has been widely claimed as an adverb or a verb in previous studies.Diachronically speaking,mo is neither the fusion of wu(无)you(攸)/wu(无)huo(或),nor the suffixation of wu by adding-k.Though difficult to trace back the original form of mo,it can be assured that mo+VP originally indicated an existential meaning.This may explain why mo can express universal quantification without any distributive meaning.
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