Wiangin, Nanthanut, Jiraporn Sukkrong, Kanaporn Kaewkamjan, Wanwipang Phonkamjad, Viyada Promchitta, & Wichien Phanon.
" Verb to be in Progressive Tense in American English." <em>วารสารพุทธปรัชญาวิวัฒน์</em> [Online], 6.2 (2022): 673-683. Web. 27 Apr. 2024