N4
んだけど・んですが
But..., And...
私は明日釣りに行くのですが先輩も行きませんか?
I am going to go fishing tomorrow, but senpai, do you also want to go?
Explanation
「んだけど・んですが」 has 2 uses
1Setting up a request
Gives the background before asking or suggesting something, often trailing off for the listener to pick up: 「質問があるんですが」 I have a question...
私は明日釣りに行くのですが先輩も行きませんか?
I am going to go fishing tomorrow, but senpai, do you also want to go?
新しいパソコンを買いたいのだけど...どれを買えばいいか分からない。
I want to buy a new computer, but… I don't know which one to buy.
2…, but
A contrast: the outcome differs from the first part, or the 'but' is left hanging: 「行きたいんだけど…」 I'd like to go, but...
「昨日の告白はどうなったの?」「告白したんだけど…。」
'How did yesterday's confession go?' 'I did confess, but… (I got turned down).'
助かるんだけど一人でできるから帰ってもいいよ。
I feel like you are being helpful, but I can handle it by myself, so you can go home.