The Particle “ga”: Subject, New Information, Emphasis [JLPT N5]

Content by NTJ Kuma · Nihongo to Japan editorial team · Updated July 27, 2026

「誰が来た？」「私が来た！」 — が marks not the topic but the protagonist of the action.

「誰が来た？」「私が来た！」 — が marks not the topic, but the protagonist of the action

「誰が来た？」「私が来た！」 — note that no one answers 「私は来た.」 That's が at its most striking: when you want to stress “it's me, not anyone else,” が steps in. が has four functions — subject・new information・the object of ability/liking・describing a scene — plus one easily-confused twin, the conjunctive が (= but). All sorted here, with plenty of examples and practice.

Core: が marks the “protagonist” and “new information”

が's four core uses share one thing: they mark the protagonist of an action/state, often with a “new information” feel (the focus sits before が):

• ① Subject (doer・existent): 猫が魚を食べた (the cat ate the fish), 雨が降る (it rains).
• ② New info／unknown (question-word subject): 誰が来た？ (who came?), ここに問題がある (there's a problem here).
• ③ Object of ability・liking・wanting: 日本語がわかる (understand Japanese), 猫が好き (like cats), 水がほしい (want water).
• ④ Description・scene report: 桜がきれいだ (the cherry blossoms are lovely), 電車が来た (the train came) — reporting a state or event as seen.

Anchor: whatever sits before が is the “protagonist” or the “newly-introduced info” the sentence highlights.

The four uses at a glance

Examples in context

• 誰がこの本を書きましたか。(Who wrote this book?) — ② question-word subject (が required)
• 日本語がわかりますか。(Do you understand Japanese?) — ③ ability object
• 私はコーヒーが好きです。(I like coffee.) — ③ liking object (big topic は ＋ object が)
• むかしむかし、おじいさんがいました。(Once upon a time, there was an old man.) — ② new introduction (story openings use が)
• あっ、バスが来た！(Oh, the bus came!) — ④ scene report (something happening before you)
• 頭が痛い。(My head hurts.) — ③ object of a sensation

⚠️ The four traps here

① A question word as subject requires が: 誰が来た？ (✗誰は来た？); the answer too: 私が来た. Because the asked “who” is new information.

② The object of liking・ability・wanting・sensation takes が, not を: 好き・嫌い・上手・下手・わかる・できる・ある・ほしい・痛い all take が for their object — 猫が好き, 日本語ができる, 水がほしい, 歯が痛い. English feels like “object,” Japanese uses が.

③ The subject inside a subordinate (modifying) clause takes が: 私が作った料理 (the dish I made), 彼が言ったこと (what he said) — the “small subject” inside a clause takes が, not は.

④ Reporting an event before you (scene sentence) takes が: 雨が降っている, 電車が来た — reporting a present state or sudden event, the subject takes が (not は).

🔄 Compare: が vs は

Going deeper: beware “the other が” — the conjunctive が (= but)

This trips up beginners constantly: the same 「が」 has a completely different identity — a conjunctive particle meaning “but／and,” attaching after a clause to join two:

• 日本語は難しいが、面白い。(Japanese is hard, but interesting.)
• すみませんが、道を教えてください。(Excuse me, but could you show me the way?)

Test: before が is a “noun” → subject／object が (猫が); before が is a “whole clause (〜だ／〜ます)” → the conjunctive “but” が (難しいですが). Also handy: 「〜のが／〜ことが」 nominalizes a verb to serve as subject／object — 泳ぐのが好き (like swimming), 日本語を話すのが上手 (good at speaking Japanese). See 「のが」 and read it as “(the act of doing …).”

💡 How to remember this

は and が are Japanese's hardest and most fascinating pair — don't expect to master them at once. First bank two practical reflexes: ① a question-word subject always takes が (誰が・何が); ② the object of 好き・わかる・できる・ほしい・痛い takes が (not を). Those two fix most of your errors. One level deeper, tell apart “noun ＋ が = subject” from “clause ＋ が = but (conjunctive)”, plus “〜のが = making an action the subject／object.” And read the を/に/で guides alongside — particles work as one system.

❓ Common Q&A

Q: What exactly is the difference between 「私は」 and 「私が」?

The focus. 「私は学生です」 = “as for me, a student” (topic is me, weight after, answering “what do you do”); 「私が学生です」 = “it's me who's the student” (stressing me as the protagonist, answering “who is the student”). は puts focus after, が puts focus in front.

Q: Why 「日本語がわかる」 with が, not を? Isn't 「わかる」 transitive?

Because 「わかる (understand)」 in Japanese expresses ability／state, and its object takes が (日本語がわかる). Same family: できる・見える・聞こえる・要る, and 好き・上手 — all take が. This is a big Japanese class: the object of “ability・sensation・liking” takes が, not を.

Q: Is the が in 「難しいですが、面白い」 a subject marker?

No! That's the other が — the conjunctive particle meaning “but／and,” attaching after a clause to join two. The test is easy: noun before が → subject が; a full clause before が (〜です／〜ます) → the “but” が. 「難しいですが」 has a clause before it, so it's “but.”

Q: What's the 「のが」 in 「泳ぐのが好き」?

「の」 nominalizes the verb 「泳ぐ」 (the act of swimming), and 「が」 marks it as the object of 「好き.」 Together 「泳ぐのが好き」 = “like swimming.” Whenever an action serves as subject or object of liking, use 「〜のが」: 料理を作るのが楽しい, 日本語を話すのが上手.

🖊️ Practice Quiz

Q1. 「___音楽が好きですか？」Fill the blank.

(A) 誰が　(B) 誰は　(C) 誰を　(D) 誰に

Q2. 「日本語___わかりますか？」Which particle is correct?

(A) を　(B) は　(C) が　(D) に

Q3. 「むかしむかし、おじいさん___いました。」(a story's opening) Which is correct?

(A) は　(B) が　(C) を　(D) で

Q4. A friend asks 「誰が発表しますか？」 and you want to say “it's me.” How do you answer?

(A) 私は発表します。

(B) 私を発表します。

(C) 私が発表します。

(D) 私に発表します。

Q5. Which sentence's 「が」 has a different use from the other three?

(A) 猫が魚を食べた。

(B) 富士山が見える。

(C) 行きたいが、忙しい。

(D) 誰が来ましたか？

Answer Key

1. (A) 誰が ── a question word (誰) as subject must use が, not は. 誰が音楽が好きですか = who likes music?

2. (C) が ── the object of 「わかる」 uses が, not を.

3. (B) が ── a first appearance in a story uses が (new information): おじいさんがいました.

4. (C) 私が発表します ── answering a question-word subject uses が (私が), because it's new info.

5. (C) ── (A)(B)(D) are the subject-marking が; (C) 行きたいが is the adversative conjunction が (but).