Maisari, Linda, and Prichatin. “Challenges Encountered by Ninth Grade Students in Learning the Present Perfect Tense”. Lexeme : Journal of Linguistics and Applied Linguistics 6, no. 2 (August 5, 2024): 195–204. Accessed December 23, 2024. https://openjournal.unpam.ac.id/index.php/LJLAL/article/view/42355.