# い-adjectives: Japanese i-adjectives explained > Learn how to use い-adjectives, a JLPT N5 Japanese grammar point meaning Japanese i-adjectives explained, with structure, nuance, examples, mistakes, and comparisons. JLPT level: N5 · Updated: 2026-05-17 · Canonical: https://hane-app.com/blog/n5-i-adjectives/ **い-adjectives** means **Japanese i-adjectives explained**. It is a **JLPT N5** Japanese grammar pattern used to describe nouns and make adjective sentences. This grammar point appears often in beginner conversations, textbooks, and JLPT-style reading questions. If you want to describe things like big, small, expensive, fun, and delicious, **い-adjectives** is a useful pattern to learn early because it connects directly to everyday communication. ## What does い-adjectives mean? Use **い-adjectives** when you want to use adjectives that end in い and conjugate directly for tense and negation. Natural translations include: - i-adjectives - adjectives ending in い - describing words The exact English translation changes with context. The important point is to understand what job the pattern is doing in the sentence, not to memorize only one English phrase. ## How to form い-adjectives い-adjectives attach directly to nouns and conjugate by replacing the final い.

い-adjective

noun

→

modifies the noun directly

い-adjective

です

→

polite sentence ending

い-adjective
drop い

くない

→

negative

い-adjective
drop い

かった

→

past

Examples of the pattern: - 高たかい店 - おいしいです - 高たかくない Pay attention to the form that comes before the grammar point. Many beginner mistakes happen because the learner understands the meaning but attaches the pattern to the wrong word form. ## When is い-adjectives used? Use **い-adjectives** in situations like: - describing nouns - making polite adjective sentences - forming negative and past descriptions Tone and register: - neutral; add です for polite speech - Common in daily speech, textbook examples, and beginner JLPT questions ## い-adjectives example sentences

この本ほんはおもしろいです。

This book is interesting.

polite / present

高たかい店みせには行いきません。

I do not go to expensive restaurants.

negative / noun modification

昨日きのうは寒さむかったです。

Yesterday was cold.

past / polite

この問題もんだいは難むずかしくないです。

This problem is not difficult.

negative / polite

新あたらしい靴くつを買かいました。

I bought new shoes.

past / noun modification

Read the Japanese sentence first, then check whether the English translation matches the feeling of the whole sentence. This helps you avoid translating each piece too literally. ## Nuance of い-adjectives The key nuance is **い-adjectives carry tense and negation themselves**. This matters because learners often know the dictionary meaning but miss the speaker's intention. In real Japanese, grammar points show attitude, politeness, contrast, certainty, desire, or context. For **い-adjectives**, focus on how the pattern changes the role of the sentence. For example: - In conversation, it can sound descriptive and flexible. - Compared with **な-adjectives**, it feels more self-conjugating. ## い-adjectives vs な-adjectives Both **い-adjectives** and **な-adjectives** can be related in beginner Japanese, but they are different.

い-adjectives

end in い and can directly modify nouns

change to くない, かった, and くなかった

高たかい車くるま。

an expensive car.

な-adjectives

need な before nouns

use です/でした patterns more like nouns

静しずかな町まち。

a quiet town.

If you are unsure which one to use, ask what the sentence is trying to do: define something, ask something, show a reason, mark a subject, describe a desire, or connect ideas. ## Common mistakes with い-adjectives

❌

高たかいな店みせ

✅

高たかい店みせ

True い-adjectives never take な before a noun.

❌

高たかいじゃない

✅

高たかくない

Negate by dropping い and adding くない.

❌

寒さむいかった

✅

寒さむかった

Remove the final い before attaching かった.

A good study habit is to make one simple original sentence, then change only one part of it. That makes the function of the grammar point easier to see. ## Is い-adjectives on the JLPT?

Yes. い-adjectives is core JLPT N5 grammar.

That means you should be able to:

recognize conjugations in reading
understand tense and negation in context
use them in simple original sentences

For test preparation, do not only memorize the English gloss. Practice identifying the word before and after the grammar point, because JLPT questions often test structure and context together.

## Practice questions for い-adjectives

Describe today’s weather with an い-adjective.

production

Make one negative い-adjective sentence.

production

Modify a noun with 新あたらしい.

production

Keep your first sentences simple. Once the form feels natural, add time words, places, reasons, or contrast to make the sentence more realistic. ## Learning path for い-adjectives Use **い-adjectives** as part of your **JLPT N5** existence, identity, adjective, and state grammar toolkit. Start by deciding whether the sentence describes identity, existence, adjective quality, change, or a continuing state. Then compare affirmative, negative, and past forms so you can see what changes and what stays stable.

Make one short affirmative sentence with an い-adjective, then say it out loud.

Change the same sentence to negative and past forms so you can see what changes and what stays stable.

Compare it with まだ to see how time words interact with adjective states.

Add もう or まだ～ていません to see how the basic meaning changes.

Write one example that contrasts い-adjectives with a related pattern from the list below.

For practice, keep the sentence short: write one example with **い-adjectives**, one example with a different subject or time word, and one example that contrasts it with a related pattern. ## Related grammar to review next - [まだ](/blog/n5-mada/) — contrasts with this pattern from the time, sequence, and experience grammar group. - [もう](/blog/n5-mou/) — contrasts with this pattern from the time, sequence, and experience grammar group. - [まだ～ていません](/blog/n5-mada-te-imasen/) — reviews another way to describe identity, existence, adjective quality, or state. - [だ・です](/blog/n5-da-desu/) — reviews another way to describe identity, existence, adjective quality, or state. ## Learn い-adjectives with Hane If you want to practice **い-adjectives** together with the related patterns above, Hane helps you build Japanese grammar in short, focused sessions. Browse more lessons here: - [All grammar lessons](/blog/) - [JLPT N5 grammar lessons](/blog/n5/)