Japanese Particle が vs を: What’s the Difference?

The Japanese particles が and を have different grammatical functions. The Japanese particle が commonly marks the subject or identifies the person or thing connected to a particular grammatical pattern. The Japanese particle を mainly marks the direct object of a verb.

Compare:

猫が魚を食べます。
Neko ga sakana o tabemasu.
The cat eats fish.

Here:

猫が (neko ga) marks the subject, the cat.

魚を (sakana o) marks the direct object, the fish.

Understanding this basic difference helps you build and analyze Japanese sentences correctly.

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What Does the Japanese Particle が Do?

The Japanese particle が commonly marks the grammatical subject. It can identify the person or thing that performs an action or the person or thing associated with a verb or adjective.

For example:

犬が走ります。
Inu ga hashirimasu.
A dog runs.

犬 (inu, dog) performs the action of running, so it is marked by が.

The basic pattern is:

Noun + Japanese particle が + verb

Examples:

鳥が飛びます。
Tori ga tobimasu.
A bird flies.

雨が降っています。
Ame ga futte imasu.
It is raining.

In these sentences, the noun marked by the Japanese particle が is associated with the action or event expressed by the verb.

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What Does the Japanese Particle を Do?

The Japanese particle を commonly marks the direct object of an action verb.

For example:

私は本を読みます。
Watashi wa hon o yomimasu.
I read a book.

本 (hon, book) is the direct object of 読みます (yomimasu, read). It is the thing affected by the action, so it is marked by the Japanese particle を.

The basic pattern is:

Topic or subject + direct object を + verb

Examples:

私は水を飲みます。
Watashi wa mizu o nomimasu.
I drink water.

彼は映画を見ます。
Kare wa eiga o mimasu.
He watches a movie.

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The Main Difference Between Japanese Particle が and を

The basic difference is:

Japanese particle	Main function	Example
が	Marks the subject or a noun connected to specific grammatical patterns	猫が寝ています
を	Marks the direct object of an action verb	魚を食べます

Compare:

猫が魚を食べます。
Neko ga sakana o tabemasu.
The cat eats fish.

猫が identifies the subject.

魚を marks the direct object.

This sentence contains both particles because the subject and direct object have different grammatical roles.

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Japanese Particle が vs を With Action Verbs

With ordinary transitive action verbs, the person or thing performing the action can be marked by the Japanese particle が, while the thing directly affected by the action is marked by the Japanese particle を.

For example:

子どもがボールを投げます。
Kodomo ga bōru o nagemasu.
The child throws a ball.

Japanese word	Particle	Role
子ども (kodomo)	が	The person performing the action
ボール (bōru)	を	The thing affected by the action

Another example:

先生が本を読みます。
Sensei ga hon o yomimasu.
The teacher reads a book.

The Japanese particle が marks the person who reads, while the Japanese particle を marks the thing being read.

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Why Does Japanese Particle が Appear With Potential Verbs?

One important difference between Japanese particle が and Japanese particle を appears with potential verbs.

Compare:

私は日本語を話します。
Watashi wa nihongo o hanashimasu.
I speak Japanese.

私は日本語が話せます。
Watashi wa nihongo ga hanasemasu.
I can speak Japanese.

In the first sentence, 話します (hanashimasu) is an ordinary action verb. 日本語 (nihongo, Japanese) is the direct object and is marked by を.

In the second sentence, 話せます (hanasemasu) is a potential form meaning “can speak.” The language is commonly marked by the Japanese particle が.

The basic patterns are:

Noun を + ordinary transitive verb

Noun が + potential verb

This difference is important when expressing ability in Japanese.

However, some modern Japanese usage also allows を with certain potential verbs. For learners, the が pattern is especially important to understand because it appears in standard ability expressions.

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Japanese Particle が vs を With 分かる

The verb 分かる (wakaru, to understand) does not use the same pattern as the English verb “understand.”

For example:

私は日本語が分かります。
Watashi wa nihongo ga wakarimasu.
I understand Japanese.

日本語 (nihongo, Japanese) is commonly marked by the Japanese particle が.

Incorrect:

日本語を分かります。

Correct:

日本語が分かります。

The Japanese sentence structure is different from the English structure. The thing understood is commonly marked by が with 分かる.

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Japanese Particle が vs を With 好き

The same distinction appears with 好き (suki, to like).

Correct:

私は猫が好きです。
Watashi wa neko ga suki desu.
I like cats.

Incorrect:

私は猫を好きです。

好き is a な-adjective, not an ordinary action verb. The thing that is liked is commonly marked by the Japanese particle が.

The same pattern appears with:

嫌い (kirai, to dislike)

上手 (jōzu, to be good at)

下手 (heta, to be poor at)

For example:

私は野菜が嫌いです。
Watashi wa yasai ga kirai desu.
I dislike vegetables.

彼は日本語が上手です。
Kare wa nihongo ga jōzu desu.
He is good at Japanese.

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Japanese Particle が vs を With ある and いる

The verbs ある (aru, to exist for non-living things) and いる (iru, to exist for living things) commonly use the Japanese particle が to mark what exists.

For example:

机の上に本があります。
Tsukue no ue ni hon ga arimasu.
There is a book on the desk.

公園に犬がいます。
Kōen ni inu ga imasu.
There is a dog in the park.

Incorrect:

本をあります。

犬をいます。

The Japanese particle を is not used because the noun is not the direct object of an action. The sentence describes existence.

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Japanese Particle が vs を With 見る and 見える

Compare these two verbs:

見る (miru), to look at or watch

見える (mieru), to be visible or to be seen

見る is an action verb and commonly takes を:

富士山を見ます。
Fuji-san o mimasu.
I look at Mount Fuji.

見える commonly uses が:

富士山が見えます。
Fuji-san ga miemasu.
Mount Fuji can be seen.

The difference is grammatical.

With 見る, a person actively looks at something.

With 見える, something is visible or comes into view.

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Japanese Particle が vs を With 聞く and 聞こえる

A similar difference appears with:

聞く (kiku), to listen to or hear

聞こえる (kikoeru), to be audible or to be heard

For example:

音楽を聞きます。
Ongaku o kikimasu.
I listen to music.

音楽が聞こえます。
Ongaku ga kikoemasu.
I can hear music.

With 聞く, music is the object of an intentional action.

With 聞こえる, the music is the thing that is audible.

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Japanese Particle が vs を With Adjectives

The Japanese particle を generally marks the direct object of an action verb. Adjectives do not usually take direct objects in the same way.

For example:

この本が面白いです。
Kono hon ga omoshiroi desu.
This book is interesting.

本 (hon, book) is the thing described by the adjective 面白い (omoshiroi, interesting), so it can be marked by the Japanese particle が.

Another example:

この町が静かです。
Kono machi ga shizuka desu.
This town is quiet.

Incorrect:

この町を静かです。

The Japanese particle を is not used because 静か (shizuka, quiet) is an adjective.

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Can Japanese Particles が and を Appear in the Same Sentence?

Yes. This is common in sentences containing a subject and a direct object.

For example:

田中さんが日本語を教えます。
Tanaka-san ga nihongo o oshiemasu.
Mr. Tanaka teaches Japanese.

田中さん (Tanaka-san) is marked by the Japanese particle が.

日本語 (nihongo) is marked by the Japanese particle を.

Another example:

犬が肉を食べています。
Inu ga niku o tabete imasu.
The dog is eating meat.

The Japanese particle が and the Japanese particle を have different functions, so they can appear naturally in the same sentence.

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How Japanese Particle が and を Work With は

The Japanese particle は can also appear with the Japanese particle を or が in the same sentence.

For example:

私は本を読みます。
Watashi wa hon o yomimasu.
I read a book.

Here:

私 (watashi) is the topic.

本 (hon) is the direct object.

Another example:

私は日本語が分かります。
Watashi wa nihongo ga wakarimasu.
I understand Japanese.

Here:

私 (watashi) is the topic.

日本語 (nihongo) is connected to 分かる and marked by the Japanese particle が.

This shows why a Japanese sentence can contain multiple particles. Each particle marks a different grammatical relationship.

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Japanese Particle が vs を With Transitive and Intransitive Verbs

The distinction between transitive and intransitive verbs is also important.

A transitive verb takes a direct object, which is commonly marked by the Japanese particle を.

For example:

ドアを開けます。
Doa o akemasu.
I open the door.

開ける (akeru, to open something) is transitive.

An intransitive verb describes something happening without a direct object.

For example:

ドアが開きます。
Doa ga akimasu.
The door opens.

開く (aku, to open) is intransitive.

Compare:

Japanese verb	Type	Example	Meaning
開ける (akeru)	Transitive	ドアを開けます	I open the door
開く (aku)	Intransitive	ドアが開きます	The door opens

This difference helps explain why one sentence uses the Japanese particle を and the other uses the Japanese particle が.

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Common Mistakes With Japanese Particle が and を

Using Japanese Particle を With 分かる

Incorrect:

日本語を分かります。

Correct:

日本語が分かります。

The thing understood is commonly marked by the Japanese particle が.

Using Japanese Particle を With 好き

Incorrect:

猫を好きです。

Correct:

猫が好きです。

好き is a な-adjective, so the thing liked is commonly marked by the Japanese particle が.

Using Japanese Particle が With an Ordinary Direct Object

Incorrect:

本が読みます。

Correct:

本を読みます。

With 読む (yomu, to read), the book is the direct object and takes the Japanese particle を.

Assuming Japanese Particle が Always Marks the Person Performing an Action

The Japanese particle が can mark the subject of an action, but it also appears in many other grammatical patterns.

For example:

私は日本語が話せます。
Watashi wa nihongo ga hanasemasu.
I can speak Japanese.

日本語 does not perform the action. The Japanese particle が is used because of the potential verb pattern.

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How to Choose Between Japanese Particle が and を

A useful starting point is to look at the verb or predicate.

Ask:

→ Is the noun the direct object of an action verb?

Use the Japanese particle を.

私は本を読みます。
Watashi wa hon o yomimasu.
I read a book.

→ Is the noun the subject of an action, event, or state?

The Japanese particle が may be used.

猫が寝ています。
Neko ga nete imasu.
The cat is sleeping.

→ Is the sentence using a pattern such as potential verbs, 分かる, 好き, ある, いる, 見える, or 聞こえる?

The Japanese particle が is commonly used.

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Key Differences Between Japanese Particle が and を

Japanese particle	Main function	Common patterns
が	Marks the subject or appears in specific grammatical patterns	Potential verbs, 分かる, 好き, ある, いる, 見える, 聞こえる
を	Marks the direct object	読む, 食べる, 飲む, 見る, 聞く

The key difference is that the Japanese particle を marks what an action directly affects, while the Japanese particle が marks the subject or appears with nouns required by particular grammatical patterns.

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Key Takeaway

→ The Japanese particle を mainly marks the direct object of a transitive verb.

→ The Japanese particle が commonly marks the subject or is used in specific grammatical patterns.

→ Use the Japanese particle を with ordinary transitive verbs such as 読む (yomu, to read), 食べる (taberu, to eat), and 飲む (nomu, to drink).

→ The Japanese particle が commonly appears with potential verbs, 分かる (wakaru, to understand), 好き (suki, to like), ある (aru, to exist), いる (iru, to exist), 見える (mieru, to be visible), and 聞こえる (kikoeru, to be audible).

→ The same noun may take different particles when the verb or sentence pattern changes.

→ Learning the complete sentence pattern is more reliable than translating directly from English.

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Conclusion

Japanese particle が and Japanese particle を are both essential for showing the grammatical relationship between a noun and the rest of a Japanese sentence.

The Japanese particle を mainly marks the direct object of a transitive verb:

本を読みます。
Hon o yomimasu.
I read a book.

The Japanese particle が commonly marks the subject or appears in specific patterns involving existence, ability, perception, understanding, preferences, and adjectives:

本が読めます。
Hon ga yomemasu.
I can read a book.

日本語が分かります。
Nihongo ga wakarimasu.
I understand Japanese.

The most reliable way to choose between Japanese particle が and Japanese particle を is to learn the complete grammatical pattern. If a noun is the direct object of an ordinary transitive verb, it usually takes を. If the sentence follows a pattern that requires が, such as 分かる or a potential verb, the Japanese particle が is commonly used instead.

What Is the Japanese Particle が?

How to Use the Japanese Particle が to Mark the Subject in Japanese

When to Use the Japanese Particle が for New Information in Japanese

How to Use the Japanese Particle が With Question Words in Japanese

How to Use the Japanese Particle が With あります and います in Japanese

How to Use the Japanese Particle が With Ability Expressions

How to Use the Japanese Particle が With 好き, 嫌い, 上手, and 下手 in Japanese

How to Use the Japanese Particle が With Verbs and Adjectives in Japanese

Can Japanese Particles は and が Appear Together in a Japanese Sentence

Japanese Particle が vs を: What’s the Difference?

How to Use the Japanese Particle が in Japanese Relative Clauses

How Context Changes the Meaning of the Japanese Particle が

Common Mistakes When Using が in Japanese