Tiittanen, Mike. “Reasons for the Use of past Verb Tenses by Mandarin-Speaking ESL Learners”. Global Journal of Foreign Language Teaching 10, no. 2 (May 29, 2020): 120–138. Accessed February 17, 2026. https://www.un-pub.eu/ojs/index.php/GJFLT/article/view/4849.