Copulative sentences with the verb "ser" in basic education: an analysis of a high school textbook: UMA ANÁLISE DE LIVRO DIDÁTICO DO ENSINO MÉDIO. (REP) [Internet]. 2025 Dec. 12 [cited 2026 Nov. 1];15(2). Available from: https://publicacoes.unifal-mg.edu.br/revistas/index.php/entreparenteses/article/view/2448