Erzhumanova А., and Elubai А. “English Indefinite Aspect: Development in Diachrony and Synchrony”. Bulletin of L.N. Gumilyov Eurasian National University. PHILOLOGY Series 128, no. 3 (September 30, 2019): 83–91. Accessed July 3, 2024. https://bulphil.enu.kz/index.php/main/article/view/442.