V+(으)ㄹ 줄 알다/모르다 ~ to know how to/not know how to

We can use V+(으)ㄹ 줄 알다 to express that one knows how to do V, or use V+(으)ㄹ 줄 모르다 to express that you don’t know how to do V.

Examples
스키를 탈 줄 몰라요.
I don’t know how to ski.

가) 무슨 한국음식을 만들 줄 알아요?
나) 떡볶이만 만들 줄 알아요.
가) What Korean foods do you know how to cook?
나) I only know how to make ddeokbokki.