Why This Lesson Matters
The difference between は and が is one of the most discussed — and most misunderstood — points in Japanese grammar. Many textbooks teach は as a “subject marker,” which leads to persistent confusion. This lesson corrects that misconception and builds a clear, practical understanding of what each particle actually does.
The Core Distinction
| Particle | Type | Grammatical role |
|---|---|---|
| が | Case particle (格助詞) | Marks the grammatical subject — who or what performs the action |
| は | Adverbial particle (副助詞) | Marks the topic — what the sentence is about |
💡 The most important point: は is not a subject marker. It marks the topic — and the topic can be the subject, the object, a location, or almost anything else. は and が are not interchangeable; they do different jobs entirely.
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