This paper is divided into five parts. The first part is the introduction, which mainly includes the origin, significance and review of the research. The second part analyzes the construction from the syntactic level. The third part analyzes the construction from the semantic level. After sorting out a large number of corpus, the semantics of the construction is divided into three categories. The fourth part analyzes the construction from the pragmatic level and summarizes its pragmatic functions according to its semantic types. The last part of the conclusion summarizes the content of the full text and points out the remaining problems to be studied.<br>
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