は vs が: The Complete Guide to Japanese's Hardest Particle
The は/が distinction confuses learners at every JLPT level — from N5 beginners to N1 candidates. This guide explains the real difference, gives you clear rules, and shows you exactly how it appears on the JLPT exam.
Why は and が Confuse Everyone
I have taught は vs が more times than I can count, and the confusion is always the same: both particles can appear in the same position, both can follow a noun that performs an action, and to a beginner they look almost interchangeable. Sometimes they nearly are. But native speakers feel the difference immediately — and the JLPT tests it at every single level.
The explanation you'll find in most textbooks — "は is topic, が is subject" — is correct but incomplete. A topic can be the grammatical subject. A grammatical subject can be the topic. Understanding the real distinction requires understanding what は and が signal to the listener, not just what grammatical function they serve.
Here is the insight I give every student who gets stuck: は and が are not just grammatical labels — they are communication signals. は says "let's talk about this." が says "this is the answer, the new information, the one I'm pointing at." Once that clicks, a lot of the confusion starts to dissolve.
5 Rules That Actually Help
Rule 1 — は marks the topic, not the subject
は (wa) marks what the sentence is about — the topic. The topic is something already known to both the speaker and listener, or something being introduced as a general point of discussion. It often answers the question 'what are we talking about?' A topic does not have to be the grammatical subject of the sentence — and this is where many learners get tangled.
Rule 2 — が marks the grammatical subject or new information
が (ga) marks the grammatical subject — the entity doing the action or being described. It also introduces new information that the listener doesn't yet know. When answering 'who?' or 'what?' questions, the answer always takes が. I tell my students: if you can hear a hidden 'it's...' before the word, が is probably right.
Rule 3 — は often implies contrast
When は appears mid-sentence or in a context where alternatives exist, it implies 'as opposed to something else.' This is why は can feel slightly adversarial. 私はわかります carries a subtle undertone of 'I understand (even if others don't).' が never does this. Once you notice it, you start hearing it everywhere in real Japanese.
Rule 4 — Stative verbs prefer が
Verbs expressing states, preferences, abilities, and perception — ある, いる, できる, わかる, 好き, 欲しい, 見える, 聞こえる — typically take が for their subject. This surprises learners who have been told は goes almost everywhere. My N4 students trip over this constantly when they learn できる.
Rule 5 — Question words always take が
Hard rule, no exceptions: 誰 (who), 何 (what), どれ (which), どこ (where as subject) always take が when they are the subject. Never は. If a student asks me which rule to memorize first, I say this one. Get it automatic. The JLPT tests it at every level.
Side-by-Side Examples
私は学生です。
I am a student.
は marks the topic. The sentence tells us something about 'me' as the established topic.
私が学生です。
I am the student (not someone else).
が marks emphasis or contrast. Used when identifying who the student is from a set of possibilities.
象は鼻が長い。
As for elephants, their noses are long.
The classic double-particle sentence. 象は = topic (elephants, as a general subject). 鼻が = subject of the predicate (the nose is what is long). This one confuses almost every beginner — and a surprising number of intermediate learners too.
誰がケーキを食べましたか？
Who ate the cake?
が is always used with question words (誰, 何, どれ). This is a hard rule with no exceptions.
日本語は難しいですが、面白いです。
Japanese is difficult, but interesting.
は sets the topic (Japanese) for the whole sentence. Both clauses say something about that same topic.
How は vs が Appears on the JLPT
The JLPT tests は vs が in two main ways:
- Fill-in-the-blank: A sentence with a blank where you choose は or が. These questions test whether you recognize a question-word sentence (requires が), a contrastive context (requires は), or a stative verb pattern (requires が).
- Sentence rearrangement: You are given scrambled parts and must put them in the correct order. These questions often hide は vs が decisions inside the arrangement task — you need to correctly identify what role each noun plays.
The trap I see most often: a sentence where both は and が sound grammatically fine, but one carries a nuance that does not fit the context. Train yourself to always ask: is this introducing new information (→ が) or establishing a known topic (→ は)?
Teacher's Note
Do not try to memorize は vs が as a rule chart. The rules help you understand the logic, but real mastery only comes from reading and listening to a lot of Japanese. Every sentence you read, ask: "why は here, not が?" You will get it wrong sometimes. That is fine. After a few hundred sentences, it starts to feel natural — and then one day you just know.
The only way to get this is practice
Nihongo Pass gives you N5–N3 grammar quizzes designed by a JLPT N1 teacher — including は vs が questions in real sentence contexts at every level.
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