Abstract
Non-finite clauses (NFCs), despite their increasingly recognized role in second language (L2) acquisition and academic writing as part of a multidimensional conceptualization of syntactic complexity, have not been analyzed in functional and discipline-specific perspectives. This study addresses this gap by providing a linguistic-descriptive account of NFC use in expert and advanced student English research writing. Using a 2.26-million-word corpus of published research articles and student manuscripts in Agricultural Science, this study profiles the distribution of NFC subtypes and identifies frequent discoursal functions realized by non-finite verb-centered formulaic sequences. The findings reveal significant differences in NFC use across writer groups, with student writers utilizing NFCs less overall and in the majority of structural subtypes. Functional analyses further demonstrate that advanced student writers employed a narrower range of formulaic frames for a narrower range of discoursal functions, highlighting both a reduced lexical repertoire and a rhetorically less sophisticated style, in regard to NFCs. Findings underscore the importance of considering a full range of lexical/phraseological and discourse-functional patterns of clause-level linguistic features, such as NFCs, in order to gain a more pedagogically interpretable understanding of syntactic complexity in L2 and academic writing.
Acknowledgments
We would like to thank Professor Ping Liu for providing the corpus data and Dr. Xiaofei Lu for comments on earlier drafts.
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Research ethics: Not applicable.
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Informed consent: Not applicable.
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Author contributions: The authors have accepted responsibility for the entire content of this manuscript and approved its submission.
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Use of Large Language Models, AI and Machine Learning Tools: None declared.
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Competing interests: The authors state no conflict of interest.
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Research funding: None declared.
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Data availability: The raw data can be obtained on request from the corresponding author.
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