Grammar Point
conjunction
conj 
が~

but, however, still, and

Sentence 1 + が + Sentence 2

The conjunction が is used to connect two sentences or clauses where the second clause contrasts with or provides a caveat to the first clause. It is often used in formal or polite contexts to soften a statement or introduce a topic before getting to the main point.

Polite Sentence + が

When used with the polite form (です or ます), が follows the sentence-final verb or adjective to introduce a contrasting idea.

I like apples, but I don't like oranges.

It is expensive, but it is very good.

Plain Form Sentence + が

In informal or written contexts, が follows the plain form of verbs, nouns, or adjectives to link two clauses.

I went to the library, but it was closed.

The food was delicious, but there was a lot of it.

Note

While が is often translated as 'but', it can also function as a simple filler to connect two related thoughts without a strong contrast, similar to 'and' or 'so' in English. In very formal speech, it is used after an introductory phrase to show politeness before making a request or asking a question.

Words: 
が
Radicals of radicals