は vs が (wa vs ga)

Two of the first particles every learner meets are は (wa) and が (ga). They look small, but choosing the wrong one changes what your sentence is about and what sounds natural to a native speaker.

The short version

• は (wa) marks the topic — what you are talking about. Think “As for X, …”
• が (ga) marks the subject — who or what performs an action, or what new information you are introducing.

Neither particle is “more important.” They answer different questions.

は — the topic particle

Use は when you set the frame of the sentence: “Speaking of this person/thing, here is the comment.”

私は学生です。
Watashi wa gakusei desu. — “I am a student.” (As for me, [I am] a student.)

今日は天気がいいです。
Kyō wa tenki ga ii desu. — “The weather is nice today.” (Today [is the topic]; the weather is what is nice.)

先生は本を読みます。
Sensei wa hon o yomimasu. — “The teacher reads a book.”

In each case, the word before は is what the rest of the sentence comments on.

が — the subject particle

Use が when you identify who or what does something, especially when that information is new or answers an implicit question.

猫がいます。
Neko ga imasu. — “There is a cat.” / “A cat exists.”

犬がいます。
Inu ga imasu. — “There is a dog.”

Existential sentences (いる / ある) almost always take が for the thing that exists — not は.

For contrast or “but” in longer sentences, が can also appear after a topic clause:

私は学生ですが、友達はまだです。
Watashi wa gakusei desu ga, tomodachi wa mada desu. — “I am a student, but my friend is not yet.”

Here the first は sets the topic; the が after です means “but” (a separate use of が).

Side-by-side: same words, different particle

| Particle | Example | Reading | Meaning | | --- | --- | --- | --- | | は | 私は学生です。 | Watashi wa gakusei desu. | I am a student. | | が | 誰が学生ですか。 | Dare ga gakusei desu ka. | Who is the student? |

Question words like 誰 (dare, who) and 何 (nani, what) pair with が, not は, when you ask who or what.

A classic pattern: topic + subject in one sentence

Textbooks often use 象は鼻が長いです (Zō wa hana ga nagai desu — “Elephants have long noses”): the elephant is the topic (は); the nose is the subject of “is long” (が). The pattern is:

[Topic] は [Subject] が [Adjective] です.

With words already in our dictionary:

学校は大きいです。
Gakkō wa ōkii desu. — “The school is big.” (school = topic)

本は新しいです。
Hon wa atarashii desu. — “The book is new.”

Common mistakes

Using は in existence sentences

• Unnatural: 猫はいます。 (for “There is a cat.”)
• Natural: 猫がいます。

Using は after question words

• Unnatural: 誰は来ますか。
• Natural: 誰が来ますか。 (Dare ga kimasu ka. — Who is coming?)

Forgetting that は is pronounced wa

The kana is は, but as a particle it is always wa, never ha.

Quick reference

| Use | Particle | Example | | --- | --- | --- | | Topic / “as for …” | は | 私は学生です。 | | Subject / new info | が | 猫がいます。 | | Question word + verb | が | 誰が… / 何が… | | “But” (after です/ます) | が | …ですが、… |

For single-particle deep dives, see は (wa) and が (ga). For the sentence-ending copula in these examples, see です (desu).