は (wa) and が (ga) are both subject markers — but they don’t mean the same thing. This is one of the most asked questions by Japanese learners, and one of the trickiest to answer. This guide breaks it down into clear, usable rules.
| Particle | Core Function | English Analogy |
|---|---|---|
| は (wa) | Topic marker — ‘as for ~, speaking of ~’ | Emphasis: ‘As for me, I…’ |
| が (ga) | Subject marker — identifies the doer | Neutral: ‘The one who…’ or ‘It is X that…’ |
Rule 1: は Marks the Topic; が Marks the Subject
Yuka「は」は話題を示す。「が」はその動作の主体を示す。同じ文で両方出てくることも多い！
(は shows the topic. が shows who performs the action. Both can appear in the same sentence.)
Example:
私は学生です。 — As for me, I am a student. (は = topic)
誰が来ましたか？ — Who came? (が = identifies the subject in a question)
田中さんが来ました。 — It was Tanaka-san who came. (が = identifies the doer)
| Sentence | Particle | Why |
|---|---|---|
| 私はマリアです。 | は | Topic: ‘As for me, I am Maria’ |
| 誰が来ますか？ | が | Question: identifies who the subject is |
| 花が咲いています。 | が | New information: ‘The flowers are blooming’ |
| 花はきれいです。 | は | Topic: ‘As for flowers, they are pretty’ |
Rule 2: が for New Information, は for Known Information
Yuka「が」は新情報、「は」は既知情報。会話の流れで決まることが多い。「猫がいる」→「猫は寝ている」の流れが典型！
(が = new information; は = known information. Context in conversation often decides it. ‘There’s a cat’ → ‘The cat is sleeping’ is the classic flow.)
Rei初めて話題に出す時は「が」、話題として確立されたら「は」に変わる。物語の冒頭に「が」が多いのはそのため！
(First mention → が; established topic → は. That’s why が appears more at the start of stories.)
Story example:
昔々、おじいさんがいました。おじいさんは山に住んでいました。
(Once upon a time, there was an old man. The old man lived in the mountains.)
First sentence: おじいさんが — introducing the character for the first time (new info).
Second sentence: おじいさんは — now talking about him as established topic (known info).
Rule 3: Contrast and Exclusion
Yuka「は」には「他は違う」というニュアンスがある。「私は行きます」は「私は行く（でも他の人は？）」という含みがある。
(は carries a ‘but not others’ nuance. 私は行きます implies ‘I will go (but what about others?)’)
| Sentence | Nuance |
|---|---|
| 私は行きます。(は) | I will go (implying: not sure about others) |
| 私が行きます。(が) | I will go (it is I who will go — not someone else) |
| 魚は食べます。(は) | Fish I do eat (but maybe not other things) |
| 魚が食べたい。(が) | It’s fish that I want to eat (desire; fish is the specific object) |
Quick Decision Chart
Use this to choose は vs が:
• Introducing something for the first time? → が
• Setting a topic (‘as for…’)? → は
• Answering ‘who?’ or ‘what?’ → が
• Contrasting (‘I do, but…’)? → は
• Expressing desire (〜が好き/〜がほしい)? → が
Quick Quiz
1. 「___学生です」— Which particle marks ‘I’ as the topic?
→ 私は学生です。(は)
2. 「誰___来ましたか？」— Which particle asks ‘who came?’
→ 誰が来ましたか？(が)
3. In ‘Once upon a time, there was an old man’ — would you use は or が for the first mention?
→ が (new information)
Still confused about は vs が? Post your example sentence in the comments! 💬
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