1. Introduction

Phrase items are composed of grammatical words that form a non continuous collocation framework and require word filling to form a complete collocation. In recent years, phrase items have become a focus of corpus linguistics research due to their unique collocation characteristics. Phrase analysis and discourse analysis systematically explore the value of phrase items in language description from two perspectives: the constraints of collocation framework meaning and the summarization of textual thematic meaning. However, existing research lacks sufficient exploration of the local grammar of phrase items, which limits the deepening of their descriptive dimensions. Local grammar focuses on the local functions generated by the co selection of words and grammar in specific texts, and has the advantage of language meaning research. There is variation in the components of phrase items, which has potential value in describing local grammar. Existing research limits the framework of phrase items to the combination of two grammatical words, without considering the changes in the framework itself, which limits the observation perspective. This article believes that the study of phrase items needs to rely on local grammar expansion to reveal the local restricted characteristics of word and grammar variants in context co selection, which is necessary for promoting corpus phraseology and discourse analysis. The article summarizes phrase items and local grammar literature, provides theoretical basis, and discusses research findings and inspirations through case analysis.

2. Literature review

The study of phrase items originated from corpus collocation analysis, focusing on the relationship between words and grammar. High frequency grammatical words form the syntactic framework, and collocation words have semantic analysis potential but are subject to grammatical constraints; Sub high frequency words are prone to forming idiomatic expressions, and their semantic content is limited by grammar; Low frequency words form a combination of grammar and semantic adaptation, with semantic selection given priority. The research began with grammatical words of 'of', which have diverse uses and can focus on or support semantic content, but do not conform to prepositional conventions. Corpus linguistics proposes the concept of "collocation framework", which consists of two grammatical words with a gap in between. Idiom principles explain the choice of collocation framework and filler words, and expand the meaning unit model to describe the complete meaning unit. The relationship between words and grammar has developed into a "common choice", and the mechanism for generating meaning is summarized as "word grammar". The development of framework analysis is accompanied by contradictions between work definition and practice. Change the grammar word collocation framework to "phrase item" and the word word collocation to "word item", construct a phrase theory framework to guide local grammar description. Phrase items are defined as non continuous frames, filled with words to form continuous collocations. Local grammar specifically describes language use in a specific context, which is different from the perspective of regular grammar. Local grammar, guided by the phrase theory framework, focuses on text types and assigns elements through contextual settings, adding new elements to the study of word grammar. The way to discover the meaning of a text is through interpretation, and the assumption of the content of the text is verified in the interpretations of classics and English translations. The use of local grammar paths to describe the local textual functions of meaning units in thematic texts has become an important research topic. The analysis of local grammar in speech acts provides reference for the description of local grammar in phrase items. This article takes the English text of the State of the Union address as an example to compare and describe the local grammar of two phrase items, analyze the feature of component co selection and the function of local text.

3. Empirical analysis

By analyzing the corpus of the US State of the Union addresses from 1945 to 2023, the usage of the phrase terms' the X is that 'and' the X is to 'was studied. Research has found that these two phrase items are frequently used in the State of the Union address in the United States and have different syntactic, semantic, and pragmatic features.

4. Conclusion

By exploring the extension of phrase items through local grammar paths, the word, grammar, and semantic productivity of phrase items were analyzed, and the co selection characteristics of framework components and filler words were explored, revealing the local features of text meaning. The study emphasizes the dynamic selection relationship and unbalanced collocation pulling force of collocation framework on filler words, as well as the text theme personality presented by word and grammar co selection. The article points out that the study of local grammar of phrase items has important value in corpus linguistics, enriching the theoretical content of word grammar and enriching the analytical framework of phrase theory. The author looks forward to more types of text analysis in the future to further expand the research on phrase terms.