This study developed the preliminary list of lexical bundles (e.g., on the other hand, the fact that) for argumentative essay writing and explored its potential applications to English for General Academic Purposes (EGAP) practice to prepare undergraduate students for their future use in academic written English genre (e.g., research papers). The list, called the Essay Bundles List (EBL), was created by extracting frequently used lexical bundles from opinion- and source-based argumentative essays by L1 English speakers. Corpora consulted include the International Corpus Network of Asian Learners of English (ICNALE), Louvain Corpus of Native English Essays (LOCNESS), PERSUADE2.0, Michigan Corpus of Upper-Level Student Papers (MICUSP), and British Academic Written English (BAWE). A total of 3,768 bundles were compared with the list of academic written English (Academic Formulas List: AFL) to confirm EBL applicability. The results showed that the EBL covers approximately 80% of the AFL, indicating its potential as an EGAP wordlist. Correspondence analysis of the top 21 frequent bundles in opinion- and source-based essays and the AFL revealed that the opinion-based bundles (e.g., I believe that) can be made suitable for academic written English with the use of inanimate subjects (e.g., it is true that), while source-based discourse bundles (e.g., in order to) imply their direct applicability. The EBL was refined to 127 bundles according to their difficulty levels on the Common European Framework of Reference (CEFR) scale (A2, B1, B2) in proficiency order. This study suggested that, basic referential bundles (e.g., the fact that) and objective stance bundles (e.g., this means that) are appropriate for A2 and B1 students. Discourse bundles (e.g., to begin with, on the one hand) should remain a focus throughout the progression from B1 to B2. Advanced referential bundles, such as the existence of, are most suitable for instruction at the B2 level.
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