Japanese Verb Conjugation Guide: Godan, Ichidan & More

Introduction

If you've been studying Japanese for a while, you've probably noticed something: verbs are everywhere, and they change shape constantly. One minute it's 食べる, the next it's 食べて, 食べた, 食べない, or 食べられる. It can feel like every sentence requires a different version of the same word.

Here's the good news — Japanese verb conjugation actually follows clear, predictable patterns. Once you understand the three verb groups and the logic behind each form, conjugation becomes something you can do on autopilot. In this guide, we'll break down the system step by step, covering the forms you'll use most as an intermediate learner.

The Three Verb Groups

Every Japanese verb falls into one of three groups. Knowing which group a verb belongs to tells you exactly how to conjugate it.

Group 1: Godan Verbs (U-verbs / Five-step verbs)

These make up about 70% of Japanese verbs. They're called "godan" (five-step) because the final kana shifts across all five vowel sounds (a, i, u, e, o) during conjugation.

Godan verbs end in a consonant + う sound: く, ぐ, す, つ, ぬ, ぶ, む, る, or う.

Examples: 書く (kaku — to write), 話す (hanasu — to speak), 読む (yomu — to read), 買う (kau — to buy)

Group 2: Ichidan Verbs (Ru-verbs / One-step verbs)

These are the easiest to conjugate. "Ichidan" means "one step" because you simply drop the final る and add the new ending. They always end in -eru or -iru in dictionary form.

Examples: 食べる (taberu — to eat), 見る (miru — to see), 起きる (okiru — to wake up), 教える (oshieru — to teach)

Group 3: Irregular Verbs

Great news — there are only two irregular verbs in Japanese:

• する (suru — to do)
• 来る (kuru — to come)

These two don't follow either godan or ichidan patterns, so you'll need to memorize their forms individually. But since there are only two, it's very manageable.

Watch Out: Tricky Verb Classification

Here's where many learners get tripped up. Some verbs end in -eru or -iru but are actually godan verbs, not ichidan. These are exceptions you'll need to memorize.

Common tricky godan verbs that look like ichidan:

Compare with true ichidan verbs: 着る (kiru — to wear), 見る (miru — to see). The best approach? When you learn a new -eru/-iru verb, check which group it belongs to right away.

Masu-Form: Polite Present/Future

The masu-form is the polite form you'll use in most everyday conversations. It's often the first conjugation Japanese learners encounter. If you need a refresher on basic grammar foundations, check out our Japanese Grammar Tips for Beginners guide.

Ichidan verbs: Drop る, add ます

• 食べる → 食べます (tabemasu)
• 見る → 見ます (mimasu)

Godan verbs: Change the final u-sound to the i-sound in the same row, add ます

• 書く → 書きます (kakimasu) — く → き
• 話す → 話します (hanashimasu) — す → し
• 読む → 読みます (yomimasu) — む → み
• 買う → 買います (kaimasu) — う → い

Irregular verbs:

• する → します (shimasu)
• 来る → 来ます (kimasu)

Negative Form: Nai-Form

The negative form lets you say "don't do" or "won't do" something.

Ichidan verbs: Drop る, add ない

• 食べる → 食べない (tabenai)
• 見る → 見ない (minai)

Godan verbs: Change the final u-sound to the a-sound, add ない

• 書く → 書かない (kakanai) — く → か
• 話す → 話さない (hanasanai) — す → さ
• 読む → 読まない (yomanai) — む → ま
• 買う → 買わない (kawanai) — う → わ (not あ!)

Irregular verbs:

• する → しない (shinai)
• 来る → 来ない (konai)

Note the special case: verbs ending in う change to わ (not あ) before ない.

Te-Form: The Swiss Army Knife

The te-form is arguably the most important conjugation to master. You'll use it for requests, connecting sentences, progressive tense, giving permission, and much more. It's the form that unlocks intermediate Japanese.

Ichidan verbs: Drop る, add て

• 食べる → 食べて (tabete)
• 見る → 見て (mite)

Godan verbs: This is where it gets a bit complex. The ending changes based on the final kana:

Exception: 行く (iku — to go) → 行って (itte), not 行いて

Irregular verbs:

• する → して (shite)
• 来る → 来て (kite)

Memory tip: Many learners remember the te-form groupings with a song set to the tune of a familiar melody. The groups are: って (u, tsu, ru), んで (mu, bu, nu), いて (ku), いで (gu), して (su).

Past Tense: Ta-Form

Good news — the ta-form follows the exact same pattern as the te-form, but you replace て with た (and で with だ).

If you've mastered the te-form, you've already mastered the past tense. For structured practice with these forms, check out our YouTube grammar lessons where Rico-sensei walks through conjugation drills with real examples.

Potential Form: "Can Do"

The potential form expresses ability — "can do" something.

Ichidan verbs: Drop る, add られる

• 食べる → 食べられる (taberareru — can eat)
• 見る → 見られる (mirareru — can see)

Note: In casual speech, the ら is often dropped: 食べれる (tabereru). This is called ら抜き言葉 (ra-nuki kotoba). It's very common in everyday conversation but considered informal.

Godan verbs: Change the final u-sound to the e-sound, add る

• 書く → 書ける (kakeru — can write)
• 話す → 話せる (hanaseru — can speak)
• 読む → 読める (yomeru — can read)

Irregular verbs:

• する → できる (dekiru — can do)
• 来る → 来られる (korareru — can come) / casual: 来れる (koreru)

Volitional Form: "Let's Do"

The volitional form expresses intention or makes suggestions — "let's do" or "I'll do."

Ichidan verbs: Drop る, add よう

• 食べる → 食べよう (tabeyou — let's eat)

Godan verbs: Change the final u-sound to the o-sound, add う

• 書く → 書こう (kakou — let's write)
• 読む → 読もう (yomou — let's read)
• 行く → 行こう (ikou — let's go)

Irregular verbs:

• する → しよう (shiyou)
• 来る → 来よう (koyou)

Quick Reference: Conjugation at a Glance

Here's a summary chart using 書く (godan), 食べる (ichidan), and する (irregular):

Example Sentences

Common Mistakes

1. Mixing up godan and ichidan for -eru/-iru verbs: Verbs like 帰る (kaeru — to return) look like ichidan but are actually godan. The te-form is 帰って, not 帰て. Always check a verb's group when you first learn it.

2. Forgetting the う → わ exception in negative form: 買う becomes 買わない, not 買あない. This is the only case where the a-column shift doesn't follow the standard pattern.

3. 行く te-form exception: 行く becomes 行って (itte), not 行いて (iite). This is the one godan く-verb that doesn't follow the regular いて pattern.

4. Overusing ら抜き (ra-nuki) in formal contexts: Dropping ら from 食べられる to say 食べれる is fine in casual speech. But in formal writing, business emails, or JLPT exams, use the full form.

5. Confusing potential and passive forms: For ichidan verbs, both the potential and passive forms are -られる. Context determines the meaning: 食べられる can mean "can eat" or "is eaten." Pay attention to the particles to figure out which one is intended.

Practice Tips

1. Conjugation Drill Sheets: Make a grid with 10 common verbs down the side and 6 forms across the top. Fill in each cell. Do this daily for two weeks — by the end, the patterns will be automatic.

2. The Verb Swap Exercise: Take a simple sentence like 本を読む (I read a book) and conjugate the verb into every form you know: 読みます, 読まない, 読んで, 読んだ, 読める, 読もう. Then do it with a different verb.

3. Conversation Practice with One Form: Spend a whole day trying to use one specific form in your Japanese. Monday: te-form. Tuesday: potential form. Wednesday: volitional form. This focused practice builds confidence with each pattern.

4. Sort Verbs by Group: When you learn new verbs, immediately categorize them as godan, ichidan, or irregular. Keep a running list in your notebook. This habit prevents confusion later.

5. Song Method for Te-Form: The te-form groupings are easier to remember as a rhythm or song. Practice chanting: "u-tsu-ru becomes tte, mu-bu-nu becomes nde, ku becomes ite, gu becomes ide, su becomes shite." Once it's a rhythm, you'll never forget it.

6. Use Conjugation in Context: Don't just drill conjugation charts. Write short diary entries or have conversations where you deliberately use different forms. Real usage cements the patterns far better than abstract drilling.

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