-(으)ㄹ 줄 알다 has two meanings: "know how to do" or "thought that."
Know how to - 수영할 줄 알아요 (I know how to swim)
Thought that - 올 줄 알았어요 (I thought you would come)
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Two distinct meanings
- 할 줄 알아요 = know how to do
- 할 줄 알았어요 = thought would do
모르다 for negative
- 수영할 줄 몰라요 (cannot swim / do not know how)
Different from -(으)ㄹ 수 있다
- 줄 알다 = learned skill
- 수 있다 = ability/possibility
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