The Big Three: は, が and を
If particles are the name-tags of Japanese, then は, が and を are the tags on the three most important jobs in any sentence: the topic, the subject, and the object. Master these three and the skeleton of nearly every sentence becomes visible. (And yes — we'll tackle the legendary "は vs が" question head-on, with rules of thumb that actually work.)
Quick pronunciation reminders from the kana chapters: as a particle, は is read "wa" and を is read "o". Their spellings are historical relics — like English "knight" keeping its silent k.
1. は — The Topic Marker: "As For…"
は (wa) points a spotlight and announces: "Here's what I'm talking about — everything that follows is about this." The closest English is "as for…":
私は学生です。(Watashi wa gakusei desu.) — As for me: student. → "I'm a student."
このラーメンはおいしいです。(Kono rāmen wa oishii desu.) — As for this ramen: delicious.
昨日は寒かったです。(Kinō wa samukatta desu.) — As for yesterday: it was cold.
Two important behaviors of the topic:
- It sticks. Once a topic is set, it silently covers following sentences until someone changes it. 田中さんは医者です。東京に住んでいます。— "Tanaka is a doctor. (He) lives in Tokyo." No need to repeat 田中さんは.
- It marks known information. You can only make something a topic if both speakers already know what you're referring to — "the" things, not "a" things. This point is the key to the は/が puzzle below.
Bonus power: contrast
は can also draw a contrast — "this one, as opposed to others":
コーヒーは飲みます。お酒は飲みません。(Kōhī wa nomimasu. Osake wa nomimasen.) — Coffee I drink; alcohol I don't.
Even the negative sentence alone (お酒は飲みません) carries a whiff of "…but other things, sure" — which is why negative sentences often prefer は.
2. が — The Subject Marker: Pointing at the New
が (ga) marks the grammatical subject — the do-er or be-er — especially when it is new information, just discovered, or being singled out:
あ、バスが来ます!(A, basu ga kimasu!) — Oh, the bus is coming! (new event, just spotted)
かばんの中にスマホがあります。(Kaban no naka ni sumaho ga arimasu.) — There's a smartphone in the bag. (introducing its existence)
田中さんが作りました。(Tanaka-san ga tsukurimashita.) — Tanaka made it. (answering "who?!" — singling out)
が also has three reserved seats where it (almost) always sits:
- Existence sentences with あります/います: 猫がいます (neko ga imasu, there's a cat).
- Question words as subject. 誰, 何, どれ can never take は: 誰が来ますか (Dare ga kimasu ka, Who's coming?) — and the answer mirrors it: 田中さんが来ます.
- Likes, skills and desires — the patterns from the vocabulary chapter: 日本の食べ物が好きです (I like Japanese food), 姉は料理が上手です (my sister is good at cooking), 日本語がわかります (I understand Japanese).
3. は vs が: The Rules of Thumb
Entire books exist on this topic, but these four rules cover the vast majority of beginner sentences:
| Rule | Use | Example |
|---|---|---|
| Old vs new | Known/established info → は New/just-introduced info → が | むかしむかし、おじいさんがいました。おじいさんは… (Once upon a time there was an old man [new → が]. The old man [now known → は]…) |
| The question test | Answering "what about X?" → Xは Answering "who/which did it?" → Xが | お仕事は? — 会社員です。 誰が来ましたか。— 山田さんが来ました。 |
| Reserved seats | あります/います, question-word subjects, 好き/上手/わかる → が | 時間があります。犬が好きです。 |
| Big statement vs description | Sentence-wide topic ("A is B") → は Neutral description of a scene/event → が | 空は青いです。(The sky is blue — general truth) 空が青いです!(Look how blue the sky is! — this moment) |
A classic illustration — same words, different questions being answered:
田中さんは学生です。— (What is Tanaka?) He's a student. The news is after は.
田中さんが学生です。— (Which one is the student?) Tanaka is. The news is before が.
Handy memory: は shines its light forward (onto the comment); が shines its light backward (onto the subject itself). And when in doubt in an "A is B" sentence, は is usually the safe choice.
4. を — The Object Marker
Compared to its dramatic siblings, を (o) is blissfully simple: it tags the direct object — the thing the verb acts upon:
パンを食べます。(Pan o tabemasu.) — I eat bread.
本を読みます。(Hon o yomimasu.) — I read a book.
映画を見ます。(Eiga o mimasu.) — I watch a movie.
日本語を勉強します。(Nihongo o benkyō shimasu.) — I study Japanese.
Pattern: [thing] を [action verb]. If you can ask "___ what?" about the verb (eat what? read what?), the answer wears を.
One refinement to remember from the vocabulary chapter: verbs of liking/understanding/having are not action verbs in Japanese — their target takes が, not を. Say 日本語がわかります (not 日本語を), 犬が好きです (not 犬を). If you internalize just this one exception now, you'll dodge one of the most common beginner errors in existence.
5. Three Particles, One Sentence
Watch all three work together:
私は毎朝、コーヒーを飲みます。でも今朝は時間がありませんでした。
(Watashi wa maiasa, kōhī o nomimasu. Demo kesa wa jikan ga arimasen deshita.)
— I drink coffee every morning [topic は, object を]. But this morning [contrast は], there was no time [existence が].
Every tag doing its exact job: は sets and contrasts topics, を marks what gets drunk, が marks what exists (or doesn't!). This is the machinery of Japanese in motion.
6. Common Mistakes to Avoid
- Writing わ instead of は. The particle is always written は, always read "wa". こんにちは!
- Using を with 好き/わかる/あります. It's 犬が好きです, 日本語がわかります, 時間があります.
- Topic-marking question words. Never 誰は or 何は — question words take が (as subjects) or other particles.
- Starting every sentence with 私は. Set the topic once, then drop it. Japanese without pronouns is not lazy — it's fluent.
- Panicking about は vs が. Even with a "wrong" choice you will be understood, and native-like instinct comes from exposure. Apply the rules of thumb, keep reading and listening, and let time do the rest.
7. Practice: Choose the Particle
Cover the answers, then check:
| Sentence | Answer & why |
|---|---|
| 私（ ）田中です。 | は — introducing yourself: topic + comment |
| すみません、トイレ（ ）どこですか。 | は — "as for the toilet, where is it?" |
| あ、ねこ（ ）います! | が — existence + newly spotted |
| 毎晩、テレビ（ ）見ます。 | を — direct object of "watch" |
| 誰（ ）先生ですか。 | が — question word as subject |
| 私はすし（ ）好きです。 | が — the 好き exception! |
| 水（ ）飲みます。ジュース（ ）飲みません。 | は / は — contrast pair |
Summary & Key Takeaways
- は (read "wa") marks the topic — known information, "as for…". It sticks across sentences and can express contrast.
- が marks the subject — new information or the singled-out answer to "who/which?".
- が owns three reserved seats: あります/います, question-word subjects, and 好き・上手・わかる targets.
- を (read "o") marks the direct object of action verbs: パンを食べます.
- Rules of thumb: old→は / new→が; "what about X?"→は / "who did it?"→が; description of the moment→が.
- は spotlights the comment; が spotlights the subject.
- Next: the location-and-direction particles に, で, へ, plus と, も and の — and suddenly you can say where, when, and with whom everything happens.