が (ga): The Subject Marker (and When to Use It)
What が marks
が is the subject particle: it points at who does the action or what is being described. It also carries a job that English handles with stress or word order — it spotlights new or important information, especially the answer to a "who?" or "what?" question.
Beyond ordinary subjects, a handful of very common N5 patterns simply hard-wire が. With existence verbs ある (things) and いる (living beings), the thing that exists takes が. With できる ("can do"), the skill or task takes が. And with the adjectives of liking, skill, and wanting — 好き, 上手, ほしい, and the 〜たい form — the object of the feeling takes が, because in Japanese it is grammatically the subject. Wanting works the same way: a wanted thing takes が with 〜ほしい, and a wanted action takes が with 〜たい — ヤッタンの弟は水がほしい ("Yattan's brother wants water").
が or は?
The particle が is constantly confused with は, because both can sit near the start of a sentence — but they do different jobs. は marks the topic ("as for…") and often points to known, background information. が marks the subject and spotlights new or specific information. Compare: 私は学生です ("As for me, I'm a student" — topic) versus 私が学生です ("I am the student" — answering "who is?").
A quick rule of thumb: if the noun answers a question word, or is brand-new to the conversation, lean toward が. If it's the known thing you're talking about, lean toward は. The difference is subtle and worth its own page — see the full breakdown in が vs は.
Where が sits — and where learners drop it
There is nothing to conjugate: が attaches directly to the noun that is the subject. The whole trick is knowing which noun gets it — and remembering not to leave it out.
| Situation | Pattern | Example |
|---|---|---|
| Subject of an action | Noun が + verb | ヤッタンが食べる |
| Answer to a question word | だれ／なに が… | だれが来た？ |
| Existence | Noun が ある／いる | 犬がいる |
| Ability | Noun が できる | 日本語ができる |
| Likes / skill / wanting | Noun が 好き／上手／ほしい | すしが好き |
Two placement habits cause most errors. First, question words (だれ, なに, どれ) take が, never は, and so does the answer that fills the gap. Second, in existence sentences the thing that exists genuinely needs が — dropping it, as in 猫いる, sounds wrong in careful speech.
が in use
When が marks a plain subject, it points at the doer or the thing being described, and often presents it as new:
ヤッタンが来ました。
ヤッタンが きました。
Yattan came.
が marks Yattan as the subject who did the action.
空が青いです。
そらが あおいです。
The sky is blue.
が presents the sky as new information being described.
猫がいます。
ねこが います。
There is a cat.
Existence verb いる takes が.
With a question word, both the question and its answer ride on が — that is where the "new information" job is clearest:
だれが来ましたか。
だれが きましたか。
Who came?
Question word だれ takes が, never は.
ヤッタンが来ました。
ヤッタンが きました。
Yattan came.
The new answer also takes が.
どれがモチのかさですか。
どれが モチの かさですか。
Which one is Mochi's umbrella?
どれ asks 'which', so it takes が.
And with the existence, ability, and feeling patterns, が sits on the thing that exists, the skill, or the object of the emotion:
つくえの上に本があります。
つくえの うえに ほんが あります。
There is a book on the desk.
ある for non-living things → が.
ヤッタンは日本語が好きです。
ヤッタンは にほんごが すきです。
Yattan likes Japanese.
好き takes が for the liked thing. Yattan, the topic, takes は.
先生はピアノが上手です。
せんせいは ピアノが じょうずです。
The teacher is good at piano.
上手 (skilled) takes が.
モチは泳ぐことができます。
モチは およぐことが できます。
Mochi can swim.
できる (ability) takes が.
Watch-outs
- Using は after a question word. だれ, なに, どれ and friends take が, not は: だれが来ましたか (✓), not だれは来ましたか.
- Using を with 好き / 上手 / できる. These take が for their object: 日本語が好き (✓), not 日本語を好き.
- Forcing が when は fits better. For known, background subjects use は: ヤッタンは学生です ("Yattan is a student" — just stating a fact about a known character).
- Dropping が in existence sentences. The thing that exists needs が: 猫がいる (✓), not 猫いる in careful speech.
The short version
- が marks the subject — the doer or the thing being described.
- Use が to introduce new information and to answer question words (だれが, なにが).
- Existence (ある／いる), ability (できる), and feelings (好き・上手・ほしい・〜たい) take が.
- は = known topic; が = new subject. For the deep dive, see が vs は.
Practice it
Choose the correct particle: が or は.
＿＿＿に入れるのに最もよいものを選びなさい。
Choose the grammar pattern that best completes the sentence.
だれ＿＿＿来ましたか。
Frequently asked questions
What does the particle が do?
が marks the grammatical subject — the person or thing doing the action or being described. It also spotlights new or important information, like the answer to a 'who?' or 'what?' question: だれが来ましたか → ヤッタンが来ました.
Why does 好き use が and not を?
In Japanese, 好き ('liked'), 上手 ('skilled'), and できる ('can do') treat their object as a subject of feeling or ability, so it takes が: 日本語が好き, ピアノが上手, 泳ぐことができる.
Which particle goes with ある and いる?
The thing that exists takes が: 本があります ('there is a book'), 猫がいます ('there is a cat'). ある is for things, いる for living beings.
When do I use が instead of は?
Use が for new information and for answers to question words (だれが, なにが). Use は for the known topic you're talking about. See the full comparison at /compare/wa-vs-ga.
Where が fits
Don't confuse it with
- Conditional 〜と · N4 — The と conditional links A to an inevitable result B: 春になると、桜が咲く. Learn the plain-form formation, why B can't be a request, and how it differs from ば/たら/なら.
- で · N5 — The particle で marks where an action happens, the means or tool you use, the material, the cause, and the scope of a superlative. Learn each use and how で differs from に.
- です · N5 — です is the polite 'to be': NOUN/な-adjective + です means 'is/are.' Learn the negative じゃありません, past でした, how です attaches to い-adjectives, and the plain だ.
- か Particle · N5 — The particle か turns a statement into a question (〜ですか), means 'or' between nouns (AかB), and makes question words indefinite: だれか someone, なにか something, どこか somewhere.
Compared side by side
See how this pattern differs from the ones it's confused with:
More N5 grammar to explore
Keep going with related patterns at the same level:
- に vs へ — に and へ both mark where you're going: 学校に行く / 学校へ行く. Learn the small nuance, why へ is read 'e', and how に also marks points in time like 7時に.
- は — は marks the topic of a sentence — 'as for X.' Learn how it flags known information, its contrast use, why it's read 'wa,' and how it differs from が.
- 〜ことができる — 〜ことができる expresses ability: dictionary-form verb + ことができる ('can do'). Learn the verb pattern, the noun + ができる pattern, the polite and negative forms, and how it compares to the potential form.
- 〜に行く — 〜に行く/来る/帰る says you go, come, or return somewhere to do something. Learn the ます-stem + に pattern, suru-nouns like 買い物に行く, and how to mark the place.
- を — を marks the direct object of a verb (パンを食べる), the path you move along (道を歩く), and the place you leave (家を出る). Learn all three uses with examples.
- 〜ように — 〜ように means 'so that ~' — an aim you can't fully control: 忘れないようにメモする. Learn the formation with potential and negative verbs, and how it differs from 〜ために.