Mumtaz, Mahrukh, Muhammad Ali Shahid, and Ghulam Skina. “Understanding Copular Verbs at Secondary Level by English Language Learners”. Pakistan Languages and Humanities Review 8, no. 4 (December 21, 2024): 467–483. Accessed January 22, 2025. https://ojs.plhr.org.pk/journal/article/view/1113.