But/Background (-는데)

-는데 is one of the most frequently used connectors in Korean. It serves multiple functions: providing background context, making a soft contrast, or setting up a situation before making a request or statement. For verbs, use -는데; for adjectives, use -(으)ㄴ데; for nouns + 이다, use -인데.

As background context: 내일 시험이 있는데 같이 공부할래요? (I have an exam tomorrow — want to study together?). Here, -는데 provides the context before asking a question. As a soft contrast: 비싸는데 맛있어요 is incorrect; for adjectives it's 비싼데 맛있어요 (It's expensive but delicious).

This pattern is challenging because of its versatility. It can mean 'but', 'and so', 'since', or simply provide background. Context determines the meaning. Mastering -는데 will make your Korean sound much more natural and connected.