This article focuses on the investigations by Li Jinxi (New Grammar of the National Language. Li Jinxi collected works. Heilongjiang Education Press, Harbin, 1924), Lu Shuxiang (Outline of Chinese Grammar. The Commercial Press, Shanghai, 1942a, Outline of Chinese grammar. Collection of Lu Shuxiang's works. Liaoning Education Press, Shenyang, 1942), Wang Li (Modern Chinese Grammar. Series in Chinese grammar. The Commercial Press, Beijing, 1943, The theory of Chinese grammar. Collection of Wang Li's works. Shandong Education Press, Jinan, 1944) and Gao Mingkai (On Chinese Grammar. Kaiming shudian, Shanghai, 1948). The aim is shedding light on their notable anticipations of contemporary theories on modality. It will be shown that those works w...