Abstract
This study investigates the types and discourse functions of grammatical subjects inresearch article introductions across four disciplines, namely: Applied Linguistics andPsychology, representing soft sciences, and Chemistry and Environmental Engineering,representing hard sciences. This study was carried out on a corpus of 40 research articleintroductions (10 from each discipline). The research article introductions were sourcedfrom twelve ISI journals published from 2008 to 2012. The corpus was analysed basedon the modified model in relation to grammatical subject types and discourse functionssuggested by Ebrahimi (2014). The results revealed that the grammatical subject typeselections were guided by the nature of the research article introduction. However, thefrequency of use of the grammatical subject types was constrained by the nature ofthe discipline. Discourse functions of grammatical subject types were predominantlydetermined by the divisions of the hard and soft sciences, and the specific disciplineswithin and the internal structure of the research article introductions. In addition, theresults of this study manifest a new framework for the analysis of discourse functions ofgrammatical subject types in research article introductions.
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