A researcher named Xu Shixuan studied and gave examples of how Bisu syntax had been affected due to the contact that they had with neighbouring languages. The traditional SOV constituent order is occasionally changed to SVO because both Chinese and Dai have SVO order. Also, another researcher, Day, analyzed Bisu noun phrase in Doi Chumphu village, Thailand. She characterized the noun phrase in Bisu, and declared that the word, [maŋ], in Bisu is a classifier and that the prefix [aŋ-] is a nominalizer. Another researcher, Gustafson, contributed a detailed grammar statement for Thailand Bisu. She described complex sentences including nominalization, relativization and complementation, as well as, a more in-depth piece information of verbal particles, pragmatically marked structures and an explanation of the role of the prefixes ang- and a- are provided in her study.
