OneDotDot Chinese Grammar · HSK 5 Grammar Point · HSK 5 一旦一旦 yídàn — “Once” The structure 一旦一旦 yídàn⋯就就 jiù⋯ is often used in Chinese to express “once.” In this pattern, 就 jiù serves as a condition marker and can be translated as “then” or “in that case.” This structure indicates that once a certain…