Prof. Yuasa's current research focuses on grammar instruction, instruction for advanced learners of Japanese, individualized instruction, and exceptions/idiosyncrasies in grammar. Her book, Modularity in Language: Constructional and Categorial Mismatch in Syntax and Semantics, was published from Mouton de Gruyter in 2005. She also edited and published several volumes, including Pragmatics and Autolexical Grammar: In Honor of Jerry Sadock (edited with Tista Bagchi and Katharine Beals, John Benjamins, 2011) and Individualized Instruction in East Asian Languages (Foreign Language Publications, 2013). Her recent publications include "Practical linguistics of Japanese: Japanese linguistics' contributions to teaching dareka/nanika" (Journal of Japanese Linguistics, 2017), “Pedagogical linguistics training for graduate students” (Journal of Language and Literature, 2020), “Constructionalization of Japanese koto imperatives” (in Modularity and Diachronic Construction Grammar, 2021), and “Exemplifying communication: What novice Japanese teachers should know about examples to foster learners’ generalizable skills” (Buckeye East Asia: Occasional Papers 1, 2022). She is the Director of the Japanese Language Program at OSU. She teaches Level 5 Japanese (Japanese 5103/5104), Intensive Japanese Grammar (Japanese 5315), and Pedagogical Syntax (EALL 7701) on a regular basis. Her commitment to teaching was recognized by the College of Arts and Sciences Outstanding Teaching Award in 2024.