LI, Yuyang. A Study on the Differences Between the Modal Verbs "ke" and "keyi" from the Perspectives of Register Grammar and Prosodic Grammar. Education Insights, SOAP, U.K., v. 3, n. 5, p. 80–89, 2026. DOI: 10.70088/hwk6ta37. Disponível em: https://soapubs.com/index.php/EI/article/view/1984.. Acesso em: 12 may. 2026.