He, Rui, Ying Zhang, Keyi Wei, and Ning Xu. 2021. “Sentence-Final Particle and Illocutionary Acts in Mandarin Learners: A Corpus-Based Study of Ma”. Journal of Second and Multiple Language Acquisition-JSMULA, December, 276-84. https://science-res.com/index.php/jsmula/article/view/26.