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句式变换是有语用理据的。英语前置句型的语用理据具体表现为该句型在语篇中的功能。以往研究局限于前置句型在语篇中的宏观功能,其微观功能很少探讨。本文先从基本理论框架入手,探讨了前置与话题的关系与可前置的句子信息。从微观角度看,英语前置句型可以实现以下语篇功能语篇的衔接与连贯;焦点强调;话题导入;对比;补充说明;语义修正。
Sentence transformation is a pragmatic reason. The pragmatic rationale of the English prepositional sentence concretely shows the function of the sentence structure in the discourse. In the past, the research limited the macroscopic functions of the pre-sentence patterns in discourse, and their microscopic functions were seldom explored. This article begins with the basic theoretical framework, discusses the relationship between prepositions and topics and the pre-sentence information. From the microscopic point of view, the pre-sentence pattern of English can achieve the cohesion and coherence of the following discourse texts; focus on stress; topic introduction; comparison; supplementary explanation; semantic correction.