"I don't know how to ..."
What grammar form(s) can I use to say things like "I don't know how to reply", "she doesn't know how to swim", etc.?

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Answer

By placing ~ㄹ/을 줄 알다 after a verb, you can indicate that one “knows how” to do that action.

So by changing 알다 to 모르다 it becomes "does not know how"

https://www.howtostudykorean.com/upper-intermediate-korean-grammar/unit-4-lessons-84-91/lesson-85/

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