Arba’in, Muhammad, Itsna Millatul Himmayati, Dwi Hastuti, Desi Nosita, and Hanung Triyoko. “Exploring Grammatical Structure: A Corpus Analysis on the Use of ‘To Be’ in Vocational Students’ WhatsApp Group Conversations Using AntConc”. Ideguru: Jurnal Karya Ilmiah Guru 10, no. 1 (January 20, 2025): 806-816. Accessed March 14, 2025. https://jurnal-dikpora.jogjaprov.go.id/index.php/jurnalideguru/article/view/1505.