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~ㄹ/을 줄 모르다 = not have the know-how to
Conventional usage: to express incompetence; lack of skill.
Colloquial usage: interchangeable with another structure –지 못하다 = not have the ability to (* not to mix up with -를 못하다, be not good at)
Usage: to express inability, impossibility within context, foreseeable future.