When you want to connect two contrasting sentences your first go to is the form -지만. You probably recognize -지만 from its derivative connective adverb, 하지만. It serves a similar function as the base form but it works in a different way. In the end both you can use to connect two sentences that are in contrast to each other.
The use of the form -지만 is very easy. You can use the form when you want to connect two sentences that are either in opposition to each other or in contrast to each other. There is nothing specific on the kind of contrast you use the form -지만 for. This unlike the contrast form -(으)ㄴ/는데 which prefers contracts which are surprising or unexpected.
While you can always use -지만 for every sentence, sometimes it is far better to use other contrasting forms as they are far more specific. They also add just that little more to the entire sentence. Other forms expressing contrast carry a certain feeling or put more emphasis on things. So treat this form as your go-to whenever you are in doubt over which contrast form to use. Or, whenever a simple ‘but’ does the work.
가: 민수 씨의 집이 어데에 있어요?
나: 민수 씨의 집이 도시 안에 없지만 큰 숲 옆에 잇어요.
A: Where is Minsu’s house?
B: Minsu’s house is not in the city, but it is next to a big forest.
How To Use
The conjugation of -지만 is among the easiest you will encounter. It uses the ‘no rule’ conjugation. That means you just need the verb stem and attach the verb ending (-지만 here) to it. You even needn’t worry over the Korean irregular verbs because they don’t act up when you use this verb. Korean grammar cannot get any easier than this.