The Neutral "But"
けど and が both join two clauses that contrast. Unlike のに, which carries frustration, these are neutral — they simply mark a turn.
Clause A + けど／が + Clause B
- 高いけど、買います。(It's expensive, but I'll buy it.)
Which One, and When
Same meaning, different register:
| Form | Register |
|---|---|
| けれども | very formal, written |
| けれど | neutral |
| けど | casual, everyday speech |
| が | slightly formal, writing and presentations |
けど is what you will say most; が is what you will read most.
Both attach to plain or polite forms. With が, keeping the polite form is normal: 高いですが、買います。
The Softener That Isn't a "But"
Very often けど/が does not contrast anything at all — it just softens an opening:
- すみませんが、駅はどこですか。(Excuse me, but where is the station?)
- ちょっとお願いがあるんですけど…(I have a small favour to ask…)
Notice the second one trails off. Leaving けど hanging is polite: it hands the conversation over instead of pressing.
けど vs のに
Both mean "but," but のに editorialises:
| Sentence | Feel |
|---|---|
| 勉強したけど、落ちた | I studied, but I failed. (neutral) |
| 勉強したのに、落ちた | I studied, and yet I failed. (frustrated) |
If you are simply reporting facts, use けど.