MUMTAZ, M.; SHAHID, M. A.; SKINA, G. Understanding Copular Verbs at Secondary Level by English Language Learners. Pakistan Languages and Humanities Review, Gujranwala, Pakistan, v. 8, n. 4, p. 467–483, 2024. DOI: 10.47205/plhr.2024(8-IV)43. Disponível em: https://ojs.plhr.org.pk/journal/article/view/1113. Acesso em: 22 jan. 2025.