Godan Verbs

Definition:

Godan verbs (五段動詞, godan-dōshi, literally “five-step/column verbs”) are the largest class of Japanese verbs. They are called “godan” because their conjugation stems move across the five vowel rows (a, i, u, e, o) of the Japanese syllabary (kana table). They are also commonly called Group 1 verbs, U-verbs (because their dictionary form ends in a u-row sound), or Type 1 verbs in textbook classifications.

Identifying Godan Verbs

The dictionary form (plain present/infinitive form) of all Japanese verbs ends in a u-row sound. Godan verbs can end in:

\Verbs ending in -ru are ambiguous — they may be godan or ichidan. Context and memorization required (see below).*

The -ru Ambiguity Problem

This is the single biggest identification challenge for Japanese learners:

• Ichidan (Group 2) verbs always end in -iru or -eru
• But NOT all -iru/-eru verbs are ichidan

Some common godan verbs that end in -iru/-eru (and must be memorized as exceptions):

• kiru 切る (cut) — GODAN (≠ kiru 着る “wear”, which IS ichidan)
• kaeru 帰る (return home) — GODAN (≠ kaeru 変える “change”, which IS ichidan)
• hairu 入る (enter) — GODAN
• shiru 知る (know) — GODAN
• iru 要る (need) — GODAN (≠ iru 居る “be/exist”, ICHIDAN)
• hashiru 走る (run) — GODAN

Rule of thumb: If a verb ends in -iru or -eru, it’s probably ichidan — but learn the common exceptions above by heart.

Conjugation Paradigm

The “five-step” nature means the stem vowel changes across conjugated forms. Using kaku (書く, to write) as the example:

Sound Changes in Te-form and Past

Godan verbs undergo sound changes (音便, onbin) in te-form and past tense — one of the major hurdles for learners:

Comparison with Ichidan Verbs

Ichidan conjugation is more regular and is often taught first, but godan verbs include most of the highest-frequency Japanese verbs (iku, kuru forms aside), so mastering their patterns is essential.

Most Important Godan Verbs for Learners (JLPT N5/N4 focus)

SLA Perspective: Learning Godan Verbs

Explicit rule learning vs. exposure:

Research suggests that for Japanese as an L2, explicit teaching of the conjugation paradigm accelerates accuracy in oral production — but the sound changes (onbin) require substantial exposure to internalize at a subconscious level.

Frequency and acquisition:

High-frequency godan verbs (iku, kaku, yomu, nomu, hanasu) are acquired early due to massive input. Low-frequency verbs with the same patterns are acquired through morphological extension — the learner applies known rules to new roots.

Common learner errors:

1. Treating all -ru verbs as ichidan: \kaeru conjugated as kaete instead of kaette*
2. Forgetting onbin: \kakute instead of kaite*
3. Generalizing iku te-form: \ikite instead of itte*

History

The godan/ichidan verb classification is a feature of Japanese grammatical tradition that developed over many centuries of systematic linguistic analysis of the language. Classical Japanese had a complex verbal paradigm with multiple conjugation classes; modern grammars simplified this into the two primary classes (godan and ichidan) plus the two irregular verbs (suru and kuru). The terms godan (五段, “five-step”) and ichidan (一段, “one-step”) were established in modern Japanese grammatical pedagogy to describe the number of vowel rows utilized in the conjugation paradigm. In Western Japanese linguistics pedagogy, the terms “Group I / Group II / Group III” or “u-verbs / ru-verbs / irregular verbs” are commonly used as pedagogical alternatives, though the underlying referents are identical.

Common Misconceptions

“Godan verbs always end in -u.” While all godan verbs have dictionary forms ending in one of the u-row sounds (ku, gu, su, tsu, nu, bu, mu, ru, u), some verbs ending in -ru are ichidan and some are godan. The -ru ending is shared by a subset of ichidan verbs and a subset of godan verbs, making the -ru group the challenging learning target. Verbs ending in sounds other than -ru are always godan; verbs ending in -iru or -eru are almost always ichidan with a small set of godan exceptions (kiru “to cut,” hairu “to enter”).

“The verb class distinction is merely a memory exercise.” The godan/ichidan distinction determines the conjugation form for every tense and aspect form the learner needs — te-form, ta-form, negative form, potential form, conditional form, all depend on knowing the verb class. Misclassification produces systematically incorrect conjugations across all forms, not just one. Understanding the classification rule rather than memorizing individual verb classes enables productive handling of new vocabulary.

Criticisms

The godan/ichidan distinction has been criticized by language pedagogues for being overemphasized in structured Japanese instruction relative to learners’ actual production needs: the vast majority of Japanese verbs are godan, and the irregular exceptions are a manageable set that can be memorized. Some communicative approaches recommend learning verb forms one conjugation-at-a-time from example sentences rather than drilling the godan/ichidan distinction abstractly — arguing that production-first exposure to conjugated forms is more efficient than meta-grammatical category learning.

Social Media Sentiment

Godan verbs (and the godan/ichidan distinction) are a foundational grammar topic in Japanese learning communities — nearly every structured Japanese learning resource addresses this distinction early, and learner anxieties about conjugation patterns are widely shared community content. Mnemonics, visual conjugation charts, and tips for identifying -ru verbs correctly are perennial community content. The “ru-verb identification trick” (check if the stem ends in -e or -i before -ru) is widely shared and memorized. Online Japanese grammar references and community wikis treat this as essential introductory content.

Last updated: 2026-04

Practical Application

The most efficient approach to godan verb conjugation is sequential: learn the te-form first (most frequently needed), then ta-form, then negative, then build other forms from these. For godan verbs specifically, the te-form sound change chart (k→i-te, g→i-de, s→sh-ite, ts/u→t-te, n/b/m→n-de, r→tt-e) is the core pattern requiring memorization. Sakubo presents verb vocabulary in sentence contexts with conjugated forms — repeated contextual exposure to godan verbs in varied conjugated forms builds pattern recognition alongside vocabulary, accelerating internalization of the conjugation paradigm.

Related Terms

• Ichidan Verbs — the other main verb class
• Suru Verbs — an irregular verb class
• Verb Conjugation — the full system
• Inflectional Morphology — the grammatical framework
• Japanese Particles — grammatical markers that work with verbs
• JLPT N5 — level at which godan verb basics are tested

See Also

• Ichidan Verbs
• Japanese Verb Conjugation
• Te-Form
• JLPT

Research

Makino, S., & Tsutsui, M. (1986). A Dictionary of Basic Japanese Grammar. Japan Times.

The authoritative reference for Japanese grammar patterns including godan and ichidan verb conjugation, providing comprehensive coverage of all conjugation forms with example sentences — the most cited Japanese grammar reference in L2 Japanese pedagogy.

Shibatani, M. (1990). The Languages of Japan. Cambridge University Press.

A descriptive linguistic account of the Japanese language including verbal morphology, providing the theoretical linguistics description of the conjugation classes underlying the pedagogical godan/ichidan distinction.

Shirai, Y., & Andersen, R. W. (1995). The acquisition of tense-aspect morphology: A prototype account. Language, 71(4), 743-762.

An SLA study examining the acquisition of Japanese verbal morphology including aspect marking and tense forms, providing empirical evidence on the developmental trajectory of Japanese verbal paradigm acquisition by L2 learners.