KARIM, S. .; SAEED, A. .; HAQ, N. .; KHARAL, A. A. . Language Learning Process: An Investigation of the Developmental Pattern of Negative Constructions using Frequency Analysis Method. Pakistan Journal of Social Sciences, [S. l.], v. 41, n. 3, p. 597-609, 2021. Disponível em: https://pjss.bzu.edu.pk/index.php/pjss/article/view/1015. Acesso em: 15 jan. 2026.