Wiangin, N., 		Sukkrong, J., 		Kaewkamjan, K., 		Phonkamjad, W., 		Promchitta, V., & 		Phanon, W.
(2022).
 Verb to be in Progressive Tense in American English.
<em>วารสารพุทธปรัชญาวิวัฒน์, 6</em>(2), 673-683.
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