Tibetan is a language with rich morphological changes, and overlapping is one of the important morphological changes. The application of this method can be found in Tubo inscriptions and ancient Tibetan manuscripts found in Dunhuang and Xinjiang. Since the13rd century poetry mirror theory was translated into Tibetan and blossomed in Tibet, these repetitive forms have become more and more common in written language parallel to spoken language, especially in literati's poems. It is impossible for this trend of written language not to affect oral literature. In modern spoken Tibetan, this traditional grammatical means has been more widely used in daily conversation and oral literature.

Dai language is a language with rich morphological changes, and overlapping is one of the important morphological changes. The application of this method can be found in Tubo inscriptions and ancient Tibetan manuscripts found in Dunhuang and Xinjiang. Since the13rd century poetry mirror theory was translated into Tibetan and blossomed in Tibet, these repetitive forms have become more popular in spoken language: J language, especially in literati's poems. It is impossible for this trend of written language not to affect oral literature. In modern spoken Tibetan, this traditional grammatical means has been more widely used in daily conversation and oral literature, and has made new progress. As far as Tibetan language around Qinghai is concerned, nouns, verbs, adjectives, adverbs, numerals and even pronouns are almost all …