Pongpuen, Tossapol, Lugsamee Nuamthanom Kimura, Wachiraporn Kijpoonphol, and Jarunee Anupan. “AN EFFECT OF A DIRECT METHOD ON 5TH GRADE STUDENTS’ ACQUISITION OF VERB INFLECTION MORPHEMES (- S, - ES, - ED, - ING)”. International Journal of Research -GRANTHAALAYAH 6, no. 6 (June 30, 2018): 310–321. Accessed May 4, 2024. https://www.granthaalayahpublication.org/journals/granthaalayah/article/view/IJRG18_A07_1474.