This grammar pattern is used with a verb. The second clause combines with an imperative or a propositive sentence ending, and the first clause explain the situation of the order or proposal.
● 피곤한데 좀 쉴까요? (We’re tired. Can we take some rest?)
● 이거 쉽지 않은데 좀 가르쳐 주세요. (This is not easy. Please teach me.)