Bielak, Jakub, and Mirosław Pawlak. “Teaching English Tense and Aspect With the Help of Cognitive Grammar: An Empirical Study”. Studies in Second Language Learning and Teaching 1, no. 3 (October 1, 2011): 365–400. Accessed March 29, 2024. https://pressto.amu.edu.pl/index.php/ssllt/article/view/5152.