Nihon-go Wayfinder
Find your way through Japanese.
Recupero delle tue preferenze…
Nihon-go
Wayfinder
Wayfinder
Find your way through Japanese.
Recupero delle tue preferenze…
は (wa) and が (ga) are the two most important and most treacherous Japanese particles, because English often hides both behind the subject or word order. In reality, they operate on two different levels: は works on the level of information (what we are talking about), while が works on the level of grammar (who or what is the subject of the clause). To distinguish them properly, you first need two concepts: topic and comment.
The topic is what the sentence is about: known or shared information, the starting point. The comment (rheme) is what is said about it, the new information added to the topic. English handles this mostly through intonation, word order, or phrases like “as for”; Japanese has a particle for it: は marks the topic, and what follows is the comment. In 私は学生です (わたしはがくせいです / watashi wa gakusei desu) “I am a student”, 私 is the topic (“as for me”), while 学生です is the comment, the new information.
が, on the other hand, marks the grammatical subject (who performs the action, or who or what something is predicated of), and it usually introduces new information (the comment). It has two typical uses. The neutral description, when stating a fact as a whole without a given topic: 雨が降っている (あめがふっている / ame ga futte iru) “it is raining”. And exhaustive identification, which focuses on that subject and no other: 私が田中です (わたしがたなかです / watashi ga Tanaka desu) “I am Tanaka (not someone else)”. That is why interrogative words as subjects always take が: 誰が来ましたか (だれがきましたか / dare ga kimashita ka) “who came?”: the answer is exactly the new information being requested.
A point that often confuses learners: topic and subject are not the same thing. The subject is a grammatical role; the topic is an informational role. は can mark the subject, but it can also topicalize the object or other elements, moving them to the front as the “matter under discussion”. In この本はもう読んだ (このほんはもうよんだ / kono hon wa mō yonda) “this book, I’ve already read”, この本 is the topic, but logically it is the object of the action, not the reader. は basically says “as for X...”, whatever grammatical role X has. That is the logic behind the famous sentence 象は鼻が長い (ぞうははながながい / zō wa hana ga nagai) “elephants have long noses”, literally “as for the elephant, the nose is long”: 象 is the topic, 鼻 the subject of 長い.
は also has a second value, the contrastive one: it sets an element against another, explicitly or implicitly. 肉は食べますが、魚は食べません (にくはたべますが、さかなはたべません / niku wa tabemasu ga, sakana wa tabemasen) “I eat meat, but not fish”: the two は contrast meat and fish. Even a single は can suggest an implicit contrast: 今日は忙しい (きょうはいそがしい / kyō wa isogashii) “today I’m busy” (unlike other days).
Finally, が is required in some fixed contexts: inside subordinate and relative clauses (私が読んだ本 (わたしがよんだほん / watashi ga yonda hon) “the book I read”), and as the object of states and feelings with words such as 好き (すき / suki) “like”, 欲しい (ほしい / hoshii) “want”, 分かる (わかる / wakaru) “understand”, and potential verbs: 日本語が分かる (にほんごがわかる / nihongo ga wakaru) “I understand Japanese”. Practical rule: は introduces or contrasts a known topic; が marks new information, identification, and the grammatical contexts that require it.