Arba’in, Muhammad, Itsna Millatul Himmayati, Dwi Hastuti, Desi Nosita, and Hanung Triyoko. 2025. “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 (1), 806-16. https://doi.org/10.51169/ideguru.v10i1.1505.