6Chou, Chao-ting Tim2006 On the Syntax-Pragmaties Interface in Chinese: A Case Study of the Attitudinal Adverb Daodi. MA thesis, Chiao Tung University, Hsinchu.
7Tsai, Wei-tien Dylan 2008 Left Periphery and How-Why Alternations. Journal of East Asian Linguistics 17, 83 - 115.
8吕叔湘.1985《近代汉语指代词》(江蓝生补).学林出版社.
9蔡维天.《为什么问怎么样,怎么样问为什么》[J].汉学研究,2000,18:41-59.
10Cinque, Guglielmo 1999 Adverbs and Functional Heads. Oxford: Oxford University Press.