| Level | Focus | Recommended Resource | |-------|-------|----------------------| | After PDF 14 (Intermediate) | Connective endings, indirect quotation | Korean Grammar in Use (Intermediate) | | Upper Intermediate | Passive/causative verbs, -느라고, -더니 | HTSK Units 5–7 | | Advanced | Formal endings, literary forms, Sino-Korean grammar | NIKL’s Advanced Korean Grammar |

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, often used to prepare for the Test of Proficiency in Korean (TOPIK). Understanding "Lesson 14" in Korean Study