||Koh, Sungran (2021). A corpus-based study on the use of the conjunctive adverbial in EFL learners academic writing. The Linguistic Association of Korea Journal, 29(2), 163-184. The purpose of this study is to identify whether there are differences in the use of conjunctive adverbials (CAs) depending on language proficiency and interlanguage background among Korean EFL learners, native English experts (NEEs) and non-native English experts (NNEEs) and then to enhance the use of CAs in English writing. To do this, the EFL learners corpora were collected twice, before class (BC) and after class (AC). They also wrote one page essays, which were subsequently collected and analyzed. For the experts corpora, NNEE corpus and NEE corpus were retrieved and used in this study. The results first show that EFL learners proficiency developed and they were able to use CAs in a more balanced and impartial way than before class. The next finding is that there was not much difference in NNEE and NEE use of CAs even though they have different interlanguage. NEEs prefer a sentence initial position more than NNEEs. NNEEs used only two CAs (also and therefore) in both initial and medial positions while NEEs used the highest frequent four CAs (for example, however, therefore, thus) in both positions.