が: The Japanese Particle Explained — Subject Marker and “But”

Yuka

I always confuse は and が. When do I use が as the subject marker?

Rei

Great question — one of the hardest things in Japanese! が marks the specific subject — who or what is doing the action or having the quality. は is the topic marker. They overlap a lot, but が is used for new information, questions, and certain verb types!

が as a Subject Marker

が (ga) is a particle that marks the grammatical subject of a sentence — who or what performs the action or has the quality. It is used when:

• Introducing new information: 誰が来た？— 田中さんが来た。 (Who came? — Tanaka came.)
• With adjectives of desire/emotion: 水が飲みたい (I want water — water is what is wanted)
• With potential verbs: 日本語が話せる (I can speak Japanese)
• In relative clauses: 私が買った本 (the book that I bought)

が as “But” (Conjunction)

が is also used as a conjunction meaning but or however. It connects two contrasting clauses. In polite speech, it often appears at the end of a sentence as a soft lead-in, leaving the sentence intentionally incomplete.

• 行きたいが、忙しい。 — I want to go, but I’m busy.
• 調べましたが、見つかりませんでした。 — I looked, but I couldn’t find it.
• よろしいですが、少々お時間をいただけますか？ — It’s fine, but could you spare a moment?
• もしよろしければ…が — If you don’t mind… (polite softening)

は vs が: Key Differences

Yuka

Can I say both 猫は好きです and 猫が好きです?

Rei

Yes, both are correct! 猫は好きです focuses on “as for cats, I like them” — it’s the topic. 猫が好きです emphasizes CATS — it’s cats specifically that I like (not dogs). In practice, 猫が好き is very common for stating likes.

Common Mistake

• Beginners often overuse は as the default subject marker. Remember: が introduces the specific subject, especially in answers to “who/what?” questions.
• With desire verbs (たい), potential verbs (できる, られる), and emotion verbs (好き, 嫌い, 欲しい) — the object is often marked with が, not を.

Quick Quiz

Fill in: は or が?

• 1. 誰___来ましたか？ (Who came?)
• 2. 私___田中です。 (I am Tanaka. [introducing yourself])
• 3. コーヒー___飲みたい。 (I want to drink coffee.)
• 4. 行きたい___、お金がない。 (I want to go, but I have no money.)

Answers: 1. が　2. は　3. が　4. が (conjunction “but”)

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Summary

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