De la Torre, Nuria, and María Cecilia Ainciburu. “Complexity and Accuracy With Ser/Estar in Different Levels of Competence in Spanish As a Foreign Language”. Porta Linguarum An International Journal of Foreign Language Teaching and Learning, no. 32 (April 18, 2021): 167–180. Accessed July 22, 2024. https://revistaseug.ugr.es/index.php/portalin/article/view/13706.