摘要：This paper, based on the proposal of crypto-functions of existential there in Dong (2016a), mainly focuses on the motive of crypto-functions in existential there. The constraints of genre on existential there in terms of indirect realization relationship between genre and lexicogrammar are firstly discussed in an attempt to locate its motive path. Then such a path is followed to explore the distribution frequencies of existential there in each genre in COCA for the intention of shedding light on the motive of crypto-functions of existential there. It is found that existential there enjoys the highest distribution frequencies, among other genres, in academic genre characteristic of hierarchical knowledge structures, and that existential there structures conducive to the verticality of the discourse in academic genre help form a semantic network about Existents, i. e. NPs and in the meantime result in the crypto-function of existential there.
其他摘要：This paper, based on the proposal of crypto-functions of existential there in Dong (2016a), mainly focuses on the motive of crypto-functions in existential there. The constraints of genre on existential there in terms of indirect realization relationship between genre and lexicogrammar are firstly discussed in an attempt to locate its motive path. Then such a path is followed to explore the distribution frequencies of existential there in each genre in COCA for the intention of shedding light on the motive of crypto-functions of existential there. It is found that existential there enjoys the highest distribution frequencies, among other genres, in academic genre characteristic of hierarchical knowledge structures, and that existential there structures conducive to the verticality of the discourse in academic genre help form a semantic network about Existents, i. e. NPs and in the meantime result in the crypto-function of existential there.
关键词：existential there;crypto-function;knowledge structure theory
