van Arkel-Simón, Carlos. “A Comparative Qualitative-Functional Analysis of Grammaticalization Phenomena in the English Progressive Construction”. Revista de Filología de la Universidad de La Laguna 39 (September 3, 2019): 71–94. Accessed November 12, 2026. https://www.ull.es/revistas/index.php/filologia/article/view/844.