Mohammad Yani Pehang, Darmanto Minggele and Hanif Cahyo Adi Kistoro 2024. Improving Understanding And Learning Activities Of Simple Present Tense Declarative Sentences Through Whatsapp-Based Substitution Drills Techniques For Mtsn Students In Kupang City. Linguanusa : Social Humanities, Education and Linguistic . 2, 3 (Nov. 2024), 1–16.