VIVANCO, Margot. To be or not to be an auxiliary verb. The case of Spanish . Borealis – An International Journal of Hispanic Linguistics, Tromsø, Norway, v. 8, n. 1, p. 35–54, 2019. DOI: 10.7557/1.8.1.4655. Disponível em: https://septentrio.uit.no/index.php/borealis/article/view/4655. Acesso em: 21 apr. 2026.