Structure
Phrase (A) + のだ(1) + が(2) + Phrase (B)
(1) んだ
(2) けれども、けれど、けども、けど
Details
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Standard
About んだけど・んですが
んだけど is an expression that combines んだ (explaining/giving cause), with けど (but). Together they translate simply as 'but...', although the nuance is actually closer to 'but with (A) as the reason… (B)', while (B) is sometimes left unsaid. This implies that the speaker is looking for a reply, or does not want to say the (B) part of the sentence out of politeness/awkwardness.
There are several different forms of this construction that are mostly interchangeable with each other. From most casual, to most formal, they are as follows:
んだけど、んだけれど、んだけれども、んだが、んですが
ん may be replaced with の in any of the above expressions. However, it will again make it slightly more formal.
Caution
んだが, or simply だが is probably the 'strongest' out of these possibilities, and is considered quite masculine. If you are going to use this form, we recommend making sure that your tone is a bit softer, so that it does not sound too authoritative.
Fun Fact
ん (or の) may sometimes be omitted completely, but this is not so common in modern Japanese.
Examples
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「昨日の告白はどうなったの?」
「こくはくしたんだけど (ふられた)。」
'How did yesterday's confession go?'
'I confessed but… (I was rejected).'
これほしいんだけど (たかい)。
I want this, but… (it is expensive).
やせられたらいいんだけど (難しいね)。
It would be great if I could lose some weight, but… (it is hard).
新しい時計を買いたいのですが (どちらがいいでしょうか)。
I would like to buy a new watch (and…) (which one would be good?)
窓が開いているからちょっと寒いんですが (どうか窓を閉めていただけませんか?)。
Since the window is open, it is a bit cold (and…) (I wonder if you wouldn't mind closing it?).
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Additional information and examples
J-Nihongo
Explanatory の / んだ / んだけど / んですが
Japanese Ammo
なんですけど・なんですが
nihongo day by day
Offline
Genki II 2nd Edition
Page 82
Tobira
Page 93
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