Aru vs Iru: The Core Japanese Existence Rule

The main rule for aru vs iru is simple: use ある for things and いる for living beings such as people and animals. So you say 本がある for “there is a book,” but 猫がいる for “there is a cat.” Beginners mix these up because English uses the same verb for both, but Japanese splits existence by animate vs non-animate.

Written by YoruLearn Team · Last reviewed: July 2026

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Aru vs Iru Rule Chart

Use	Japanese	Example
Things / objects / places	ある	本がある。机がある。学校がある。
People / animals / living beings	いる	人がいる。犬がいる。先生がいる。

Fast memory trick: if it is alive, start by assuming いる. If it is a thing, start by assuming ある.

Basic Sentence Patterns

Meaning	Japanese
There is a book on the desk.	机の上に本があります。
There is a cat in the park.	公園に猫がいます。
I have a younger sister.	妹がいます。
The station is near here.	この近くに駅があります。

Notice the location marker に. If you need particle support, open JLPT N5 Particles List.

Why This Feels Hard to Beginners

English uses one broad idea — “there is / there are.” Japanese makes you choose based on the kind of thing that exists. That is why 犬がある sounds wrong, even though a learner might copy the English pattern directly. The grammar is simple once the category rule becomes automatic.

Borderline Cases: Plants, Robots, and “Having” Family

Situation	Natural pattern	Why
A tree in a park	公園に木があります。	Trees and plants are commonly described as part of a place or landscape, so ある is the safe beginner pattern.
A family member	妹がいます。	Japanese expresses “I have a younger sister” as the existence of a living person.
A robot as a machine	ロボットがあります。	Use ある when it is treated as an object or device.
A character-like robot	ロボットがいます。	Use いる when the speaker treats it like an independent being.

When a case feels unclear, ask what the speaker is emphasizing: an object located somewhere, or a living or person-like presence. Then practise the sentence with Japanese sentence structure instead of memorizing the verb alone.

5 Common Mistakes with Aru vs Iru

Using ある for animals. Animals normally take いる.
Using いる for objects. Books, chairs, and stations take ある.
Forgetting the location particle に. It is common in existence sentences.
Translating “have” too literally. Japanese often uses existence patterns like 兄がいます for “I have an older brother.”
Memorizing the rule without examples. Category rules become reliable only when you see many sentence patterns.

Frequently Asked Questions

What is the difference between aru and iru?

Aru is for things and non-living existence. Iru is for people, animals, and other living beings.

Do you use iru for cats and dogs?

Yes. Animals normally take いる because they are living beings.

Do you use aru for books and chairs?

Yes. Objects and places use ある.

Why does Japanese use aru vs iru?

Japanese separates existence by animate versus non-animate categories, while English usually does not.

Which particle is common with aru and iru?

The location particle に often appears in existence sentences, such as 机の上に本があります.

Which page should I study with this one?

Use sentence structure, the N5 particles list, question words, and Japanese verb groups to strengthen the pattern.

Related Study Pages

Japanese Sentence StructureSee where existence verbs fit in the sentence. JLPT N5 Particles ListUnderstand why に often appears with ある and いる. Japanese Question WordsBuild follow-up questions like どこ and 何. Japanese Verb GroupsPlace ある and いる inside the broader verb system.

Make Core Existence Patterns Automatic

YoruLearn helps you review high-frequency grammar pairs like ある and いる until the choice becomes automatic in sentence-level practice.

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