Pongpuen, Tossapol, Lugsamee Nuamthanom Kimura, Wachiraporn Kijpoonphol, and Jarunee Anupan. 2018. “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 (6):310-21. https://doi.org/10.29121/granthaalayah.v6.i6.2018.1376.