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
Both は and が can appear in the same position in a sentence. Both can follow a noun that performs an action. To a beginner, they look interchangeable — and sometimes they are nearly so. But native speakers feel the difference immediately, and the JLPT tests it constantly, at every level.
The traditional explanation — "は is topic, が is subject" — is correct but incomplete. A topic can be the grammatical subject. A subject can be the topic. Understanding the real distinction requires understanding what は and が signal to the listener, not just what grammatical role they play.
After years of teaching learners from Vietnam, Mongolia, and Indonesia, I have found that the key insight most learners are missing is this: は and が are not just grammatical markers — they are communication signals. は says "let's talk about this." が says "this is the answer, the new information, or the emphasis."
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 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.
Rule 2 — が marks the grammatical subject or new information
が (ga) marks the grammatical subject — the entity performing the action or being described. It is also used to introduce new information that the listener does not yet know. When answering 'who?' or 'what?' questions, the answer always takes が.
Rule 3 — は often implies contrast
When は appears mid-sentence or in contexts where a contrast is possible, it implies 'as opposed to something else.' This is why は can feel adversarial. 私はわかります (I understand, [but others might not]). が never carries this implication.
Rule 4 — Stative verbs prefer が
Verbs expressing states, preferences, abilities, and desires (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, not は. This surprises many learners who expect は everywhere.
Rule 5 — Question words always take が
This is a hard rule with no exceptions: 誰 (who), 何 (what), どれ (which), どこ (where as subject) always take が when they are the subject of a sentence. Never は.
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.
Classic double-particle sentence. 象は = topic (elephants, as a general subject). 鼻が = subject of the predicate (the nose is what is long).
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). Never は.
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 describe properties of that 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.
The most common JLPT trap: a sentence where either は or が sounds grammatically possible, but one carries a nuance that does not match the context. Train yourself to always ask: is this introducing new information (→ が) or establishing a 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 mastery comes from reading and listening to real Japanese. Every sentence you read, ask yourself: "why は here, not が?" Over time, the feeling becomes natural.
Practice は and が in context
Nihongo Pass includes N5–N3 grammar quizzes designed by a JLPT N1 teacher, with is vs が questions at every level.
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