This is COREFL (CORpus of English as a Foreign Language), version v2.0 (Oct. 2025). It is freely available under a Creative Commons license (CC BY-NC-ND 3.0 ES) .
Please cite this paper when using data from COREFL in your studies or simply when referring to the corpus (click on the title of the paper to request a copy):
Lozano, C., Díaz-Negrillo, A., & Callies, M. (2020). Designing and compiling a learner corpus of written and spoken narratives: COREFL. In C. Bongartz & J. Torregrossa (Eds.), What’s in a Narrative? Variation in Story-Telling at the Interface between Language and Literacy (pp. 21-46). Peter Lang. https://doi.org/10.3726/978-3-653-05182-7