The current study examined the potential language and literacy factors that best explain the L2 reading comprehension abilities of Korean EFL learners. A total of 70 intermediate-level Korean high school students participated in this study and were tested on L1 and L2 reading comprehension, L2 vocabulary, and L2 syntactic knowledge. The findings indicated that, between L1 reading skills and L2 proficiency, L2 proficiency played a more crucial role in predicting L2 reading comprehension. Throughout the analyses, the linguistic threshold hypothesis was supported, demonstrating a threshold level of language proficiency above which learners can effectively transfer their L1 reading skills to L2 reading comprehension. These results highlight the important pedagogical implications for the critical role of L2 proficiency and show the threshold level of proficiency necessary for Korean EFL learners. The insights gained from this study are expected to provide targeted instructional strategies and recommendations, aimed at effectively supporting EFL learners with diverse skills and abilities.

The current study examined the potential contribution of advanced Korean EFL learners’ writing abilities to their reading comprehension abilities. A total of 191 college students participated in this study and were tested on writing and reading comprehension abilities as well as other literacy-related measures including listening comprehension, textreading fluency, and knowledge of vocabulary to control for their effects. In order to account for different aspects of writing and reading comprehension abilities, multiple measures of reading and writing abilities were adopted. The Structural Equation Modeling (SEM) analyses demonstrated that the advanced Korean EFL learners’ English writing abilities had a significant effect on their reading comprehension abilities when other relevant literacy skills were controlled for. Furthermore, their writing abilities mediated the relationship between vocabulary knowledge and reading comprehension abilities. These results highlight the important pedagogical implications on the critical role of writing abilities in enhancing the reading comprehension abilities of L2 learners.