Japanese Verb Classes: A Clear Guide for Learners

Japanese verb classes determine how verbs change for tense, negation, requests, commands, and other grammar patterns. The three main groups are godan verbs, ichidan verbs, and irregular verbs.

Learning the class of a verb means you can predict its conjugations instead of memorising every form separately. The key question is usually not only how a verb ends, but also which sound appears before る.

The Three Japanese Verb Classes

Japanese verbs include two large regular groups and a small irregular group.

• Godan verbs: often called u-verbs or consonant-stem verbs. Their final kana changes within the same consonant row.
• Ichidan verbs: often called ru-verbs or vowel-stem verbs. Their stem usually stays the same while る is removed.
• Irregular verbs: common verbs such as する and 来る, whose conjugations must be learned separately.

The names describe how verbs behave in modern Japanese grammar. Godan means “five levels,” referring to movement through the five vowel grades or sounds—a, i, u, e, and o—within the ending’s consonant row. Ichidan means “one level,” because the stem generally remains stable.

For example, the godan verb 書く (kaku, to write) changes its final kana: 書かない (kakanai, do not write), 書きます (kakimasu, write), 書く (kaku, write), 書けば (kakeba, if someone writes), and 書こう (kakō, let’s write).

An ichidan verb such as 食べる (taberu, to eat) usually behaves more simply: 食べない (tabenai, do not eat), 食べます (tabemasu, eat), 食べれば (tabereba, if someone eats), and 食べよう (tabeyō, let’s eat).

How to Identify Godan and Ichidan Verbs

A verb ending in る is not automatically an ichidan verb. Many common verbs ending in る are godan verbs, including 帰る (kaeru, to return), 入る (hairu, to enter), and 走る (hashiru, to run).

A useful first check is the kana before る:

• Verbs with an e-row sound before る are often ichidan: 食べる (taberu, to eat), 見せる (miseru, to show).
• Verbs with an i-row sound before る are often ichidan: 見る (miru, to see), 起きる (okiru, to wake up).
• Some i-row and e-row endings are still godan verbs, so the pattern is not absolute.
• Verbs ending in other sounds, such as く, む, す, or う, are generally godan.

The historical labels kami-ichidan and shimo-ichidan may appear in textbooks or dictionaries. In modern grammar, kami-ichidan verbs have an i-vowel immediately before る, while shimo-ichidan verbs have an e-vowel immediately before る. For practical study, both usually follow the same stable-stem conjugation pattern in everyday study.

The safest approach is to learn each new verb with its class. A dictionary may label a verb as godan or ichidan, and a teacher can confirm difficult cases while you practise producing complete sentences.

Conjugation Patterns That Matter Most

For godan verbs, the final kana changes according to the grammar pattern. The vowel attached to the final consonant changes, shifting the final kana within the same consonant row. With 書く (kaku, to write), the く ending moves through the relevant vowel grades:

• Negative: 書かない (kakanai, do not write)
• Polite: 書きます (kakimasu, write)
• Dictionary form: 書く (kaku, write)
• Conditional: 書けば (kakeba, if someone writes)
• Volitional: 書こう (kakō, let’s write)
• Imperative: 書け (kake, write!)

For ichidan verbs, remove る and attach the appropriate ending. With 開ける (akeru, to open), the stem 開け (ake) becomes 開けない (akenai, do not open), 開けます (akemasu, open), 開ければ (akereba, if someone opens), and 開けよう (akeyō, let’s open).

The irregular verbs する and 来る require separate attention. する becomes しない (shinai, do not do), します (shimasu, do), して (shite, do and...), and しよう (shiyō, let’s do). 来る becomes 来ない (konai, do not come), 来ます (kimasu, come), 来て (kite, come and...), and 来よう (koyō, let’s come).

The same distinction helps with the て-form. A godan verb may change in several ways: 書く (kaku, to write) becomes 書いて (kaite, write and...), while 飲む (nomu, to drink) becomes 飲んで (nonde, drink and...). An ichidan verb simply loses る: 食べる (taberu, to eat) becomes 食べて (tabete, eat and...).

Practice should connect each form to a communicative purpose. Instead of copying isolated endings, try producing a sentence about what you did, what you want, what you must do, or what you would recommend.

私は毎日、日本語の本を読みます。
Watashi wa mainichi, Nihongo no hon o yomimasu.
I read a Japanese book every day.

昨日、友達と映画を見た。
Kinō, tomodachi to eiga o mita.
I watched a film with a friend yesterday.

このドアを開けないでください。
Kono doa o akenai de kudasai.
Please do not open this door.

週末に料理を作ろう。
Shūmatsu ni ryōri o tsukurō.
Let’s cook this weekend.

Common Mistakes and Better Practice

Learners often confuse godan and ichidan verbs because the dictionary form alone does not always reveal the class. A frequent trap is assuming every verb ending in る is ichidan. 帰る (kaeru, to return) is godan, while 変える (kaeru, to change something) is ichidan, despite having the same kana reading and romanization.

Another common mistake is treating the stem as if it never changes. In 書く (kaku, to write), the vowel attached to the final consonant changes as the verb becomes 書きます (kakimasu, write), 書けば (kakeba, if someone writes), and 書こう (kakō, let’s write).

Useful habits include:

• Record the dictionary form and class together.
• Practise one verb across several grammar forms.
• Say the forms aloud rather than only recognising them.
• Write a short sentence that makes the meaning clear.
• Review verbs you repeatedly misclassify.

A practical drill is to classify, conjugate, and contrast 帰る (kaeru, to return) with 変える (kaeru, to change something). First identify the classes, then produce the negative, polite, and て-forms. In one-on-one lessons over LINE, a teacher can listen for class recognition, ending selection, pronunciation, and sentence-level grammar, then help you correct the contrast in context.

The standard Kind Japanese lesson is a 25-minute one-on-one lesson over LINE, making it possible to work on a small, specific verb goal. For additional speaking practice, How to Practice Speaking Japanese Alone offers ideas for turning grammar knowledge into active output. Learners who are starting from the basics may also find Online Japanese Classes for Beginners That Work useful when choosing a structured approach.

If you want personalised practice with Japanese verb classes, book a Free Trial Lesson over LINE and bring a few verbs that you regularly confuse.

FAQ

Are all Japanese verbs ending in る ichidan verbs?

No. Many る-ending verbs are godan verbs, including 帰る (kaeru, to return), 入る (hairu, to enter), and 走る (hashiru, to run). The kana before る offers a useful clue, but dictionary labels and actual conjugation tests are safer. When uncertain, check the class before building more forms.

What are the most important Japanese verb classes to learn first?

Start with godan, ichidan, and irregular verbs because these categories explain most everyday conjugation patterns. Learn each new verb with its class, then practise negative, polite, て-form, past, conditional, and volitional forms. This turns classification into a practical grammar tool instead of another isolated label.

What do kami-ichidan and shimo-ichidan mean?

Kami-ichidan and shimo-ichidan are traditional labels for two types of ichidan verbs. Modern kami-ichidan verbs have an i-vowel immediately before る, while shimo-ichidan verbs have an e-vowel immediately before る. Both generally use the same stable vowel-stem pattern, so learners can focus on accurate conjugation in everyday study.

Can a teacher help me identify difficult verb classes?

Yes. A teacher can ask you to conjugate a verb, explain its meaning, and use it in a sentence, then locate the exact error. One-on-one feedback is especially helpful when a learner understands the grammar rule but repeatedly applies an ichidan pattern to a godan verb, or mixes up similar forms while speaking.