About this resource:
understanding the function and meaning of a range of defective nouns (불완전 명사, for example, 동안, 때, 뻔, 것/거, 척, …) used in complex structures, and using them appropriately: …노래하는 동안(에) …; 한국에 갈 때(에) …; 비행기를 못 탈 뻔했어요; 학교에 갔을 거예요; 바쁜 척 했어요
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http://rdf.australiancurriculum.edu.au/elements/2018/05/74b4e5eb-bb82-4434-9f9a-5f033d939fd9.rdf