SUTARYANTO. AUXILIARY VERBS. Langit Biru: Jurnal Ilmiah Aviasi, indonesia, v. 3, n. 6, p. 27–48, 2020. DOI: 10.54147/langitbiru.v3i6.302. Disponível em: https://jurnal.overthinkingku.com/index.php/jurnal-ilmiah-aviasi/article/view/302. Acesso em: 14 may. 2026.