Quick Reference

Meaning & Definition

Every Japanese sentence about existence forces a choice most languages never ask you to make: is the thing you’re talking about alive or not? Aru is the answer whenever it isn’t.

Aru means ‘to exist’ or ‘to have’ for inanimate objects, places, and abstract things — books, buildings, money, time, plans, problems. Its counterpart iru covers people and animals, so between the two verbs the entire concept of existence gets split along a single line: living or not living. The core pattern ‘X ga aru’ does double duty in English translation. ‘Kaban ga aru’ can mean either ‘There is a bag’ or ‘I have a bag’ depending on context, because Japanese doesn’t need a separate verb for possession the way English relies on ‘to have.’ That’s why ‘jikan ga aru’ (there is time / I have time) and ‘okane ga aru’ (there is money / I have money) sound completely natural to Japanese speakers — existence and possession are treated as the same grammatical event.

How to Use It

The single most common beginner mistake is reaching for aru when the subject is a person or pet: ‘Imouto ga aru’ is wrong — it has to be ‘imouto ga iru’ (I have a younger sister), because siblings are alive. Aru also breaks the normal verb pattern in its negative form: instead of the expected ‘-aranai’ shape, the plain negative is simply nai, an irregular form learners just have to memorize. Aru also shows up early inside the fixed expression ‘koto ga aru,’ attached after a past-tense verb to mean ‘have done X before’ (e.g., ‘tabeta koto ga aru’ — I’ve eaten it before) — a structure that looks like plain existence but actually marks personal experience.

Example Sentences

Cultural Context

The aru/iru split isn’t just a vocabulary quirk — it reflects how deeply animacy is wired into Japanese grammar. English uses one all-purpose ‘there is/are’ for a chair, a dog, and a person alike, treating existence as a single neutral fact. Japanese forces the speaker to classify the world every time they mention something existing at all, and that same living/non-living boundary reappears elsewhere in the grammar, from counter words to certain verb choices, making aru a small daily reminder of a distinction English speakers rarely have to think about.

Aru also has a formal descendant hiding in plain sight: gozaimasu, the polite existence verb heard in shops, announcements, and customer service. It traces back through ‘de gozaru’ to the same root idea of existing, just wrapped in layers of humble, respectful speech. Most learners say a piece of this verb every single day without realizing it: arigatou gozaimasu, ‘thank you,’ literally leans on this polite form of ‘to exist’ to express gratitude — meaning the very first verb of existence a beginner learns is quietly built into one of the first phrases they ever memorize.

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