The most natural structural units of Chinese are the word,judou phrase and four character idiom(FCI). In the scattered sentences FCI are partly hidden and partly visible,while in the pian sentences they are the most active chunks. FCI are the key to solve the mystery of the seamless connection of the mode of scattered sentences with that of pian sentences.Once we understand the parallel attribute of Chinese syntax in perspective of Chinese culture,the grammatical value of FCI stand out. Once the structure o...