Oktavianti, I.N. et al. 2026. Exploring Politeness Through Modality: A Corpus-Based Analysis of Modal Verbs in Indonesian EFL Textbooks. JOLLT Journal of Languages and Language Teaching. 14, 2 (Apr. 2026), 779–790. DOI:https://doi.org/10.33394/jollt.v14i2.18131.