Chaos and Order

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Introduction

Japanese verb conjugation looks complex at first, but it is actually highly regular. Unlike English irregular verbs that must be memorized one by one, once you know which "group" a verb belongs to, you can build most of its conjugated forms by rule.

The key is three steps:

1. Identify which of the three groups the verb belongs to.

2. Apply the group-specific conjugation rules.

3. Get comfortable with the sound-change (onbin) rules, especially for the te-form and ta-form.

Nail those three and you can systematically handle the masu-form, dictionary form, nai-form, te-form, ta-form, potential, volitional, imperative, conditional, passive, and causative. This guide organizes each form with conjugation tables and examples, pointing out the spots where learners tend to stumble.

The Three Verb Groups

Japanese verbs split into three groups by conjugation pattern. School grammar calls them godan, ichidan, and irregular verbs; Japanese-language teaching calls them Group 1, Group 2, and Group 3.

| --- | --- | --- | --- |

Identification Rules

Look at the final sound of the verb's dictionary form.

1) If it does NOT end in "ru" → always Group 1

kaku, nomu, hanasu, kau

2) If it ends in "ru" → check the preceding vowel

- preceded by a/u/o row → Group 1

aru, tsukuru, noru

- preceded by i/e row → usually Group 2

taberu, miru, okiru

3) suru and kuru → Group 3 (irregular)

Caution: iru/eru Endings That Are Actually Group 1

When the preceding vowel is the i/e row it is usually Group 2, but some verbs are exceptionally Group 1. These must be memorized.

| Looks like Group 2 but is Group 1 | Meaning |

| --- | --- |

| kaeru (帰る) | to return home |

| hairu (入る) | to enter |

| hashiru (走る) | to run |

| kiru (切る) | to cut |

| shiru (知る) | to know |

| iru (要る) | to need |

masu-form (Polite Form)

The first form most people learn. It is the polite way of saying "do."

- **Group 1**: u-row ending → i-row + masu

kaku → kakimasu

nomu → nomimasu

hanasu → hanashimasu

kau → kaimasu

- **Group 2**: drop the final ru + masu

taberu → tabemasu

miru → mimasu

- **Group 3**:

suru → shimasu

kuru → kimasu

The masu-form minus "masu" (kaki, tabe) is called the "continuative form" or "masu-stem" and is the base of many later conjugations.

Dictionary Form

The base form listed in dictionaries; the plain (casual) present/future form. It is also the reference for group identification.

kakimasu → kaku

tabemasu → taberu

shimasu → suru

nai-form (Negative Form)

The plain negative, "do not."

- **Group 1**: u-row ending → a-row + nai (but u-ending becomes wa)

kaku → kakanai

nomu → nomanai

kau → kawanai *note u → wa

- **Group 2**: drop the final ru + nai

taberu → tabenai

miru → minai

- **Group 3**:

suru → shinai

kuru → konai *note pronunciation

te-form — The Heart of Conjugation

The te-form is the single most important conjugation in Japanese. It is the connective "and/so," and the base of countless patterns like te-iru (progressive), te-kudasai (request), and te-mo-ii (permission). The Group 1 te-form involves sound changes (onbin), so you must learn the rules precisely.

Group 1 te-form Sound-Change Rules

There are four sound changes depending on the ending.

1) ends in u/tsu/ru → tte

kau → katte matsu → matte noru → notte

2) ends in mu/bu/nu → nde

nomu → nonde asobu → asonde shinu → shinde

3) ends in ku → ite / ends in gu → ide

kaku → kaite oyogu → oyoide

*Exception: iku → itte (irregular!)

4) ends in su → shite

hanasu → hanashite kasu → kashite

iku formally belongs to (3) but exceptionally becomes itte. It is a common verb, so be sure to remember it.

Group 2/3 te-form

- **Group 2**: drop the final ru + te

taberu → tabete

miru → mite

- **Group 3**:

suru → shite

kuru → kite

te-form Table (Group 1)

| Ending | Sound change | Example (dictionary → te-form) |

| --- | --- | --- |

| u/tsu/ru | tte | au → atte |

| mu/bu/nu | nde | yomu → yonde |

| ku | ite | kiku → kiite |

| gu | ide | isogu → isoide |

| su | shite | dasu → dashite |

| iku (exception) | tte | iku → itte |

Major Patterns Built from the te-form

hon o yonde imasu. (I am reading a book.) → progressive

mado o shimete kudasai. (Please close the window.) → request

suwatte mo ii desu. (You may sit.) → permission

tabete wa ikemasen. (You must not eat.) → prohibition

ta-form (Past Form)

The ta-form is the plain past. It is made exactly like the te-form — just change te to ta and de to da.

kaite → kaita (wrote)

nonde → nonda (drank)

hanashite → hanashita (spoke)

tabete → tabeta (ate)

itte → itta (went)

In other words, once you master the te-form, the ta-form solves itself. That is why the te-form is called the heart of conjugation.

Potential Form (Can Do)

- **Group 1**: u-row ending → e-row + ru

kaku → kakeru

nomu → nomeru

hanasu → hanaseru

- **Group 2**: drop the final ru + rareru (the ra-dropped "ra-nuki" form is also common in speech)

taberu → taberareru (or colloquial tabereru)

miru → mirareru (or mireru)

- **Group 3**:

suru → dekiru

kuru → korareru (or koreru)

When a verb becomes potential, the object's particle tends to shift from o to ga.

nihongo o hanasu → nihongo ga hanaseru

(speak Japanese → can speak Japanese)

Volitional Form (Let's, I'll)

Expresses invitation ("let's") or the speaker's intention.

- **Group 1**: u-row ending → o-row + u

kaku → kakou

nomu → nomou

- **Group 2**: drop the final ru + you

taberu → tabeyou

miru → miyou

- **Group 3**:

suru → shiyou

kuru → koyou

Imperative and Conditional

Imperative

A strong command. It sounds rough in conversation, so use it carefully.

Group 1: u-row → e-row kaku → kake nomu → nome

Group 2: ru → ro taberu → tabero miru → miro

Group 3: suru → shiro kuru → koi

Conditional (ba-form)

Expresses the hypothetical "if."

Group 1: u-row → e-row + ba kaku → kakeba nomu → nomeba

Group 2: drop ru + reba taberu → tabereba

Group 3: suru → sureba kuru → kureba

Passive and Causative

Passive (be done to)

- **Group 1**: u-row → a-row + reru (u-ending becomes wa)

kaku → kakareru nomu → nomareru kau → kawareru

- **Group 2**: drop the final ru + rareru

taberu → taberareru miru → mirareru

- **Group 3**: suru → sareru, kuru → korareru

Causative (make/let do)

- **Group 1**: u-row → a-row + seru

kaku → kakaseru nomu → nomaseru

- **Group 2**: drop the final ru + saseru

taberu → tabesaseru miru → misaseru

- **Group 3**: suru → saseru, kuru → kosaseru

Group 1 Full Conjugation Table (kaku example)

| Form | Shape | Meaning |

| --- | --- | --- |

| Dictionary | kaku | write |

| masu-form | kakimasu | write (polite) |

| nai-form | kakanai | do not write |

| te-form | kaite | write and / by writing |

| ta-form | kaita | wrote |

| Potential | kakeru | can write |

| Volitional | kakou | let's write |

| Imperative | kake | write! |

| Conditional | kakeba | if I write |

| Passive | kakareru | be written |

| Causative | kakaseru | make write |

Aspect Expressions Derived from the te-form

The te-form does not stand alone; auxiliary verbs attach to it to express various "aspects." These are extremely common in conversation, so it is good to learn them together with the te-form.

| Form | Meaning | Example |

| --- | --- | --- |

| te iru | progressive / ongoing state | tabete iru (is eating) |

| te aru | prepared state (transitive) | kaite aru (is written) |

| te oku | do in advance | katte oku (buy in advance) |

| te shimau | completion / regret | tabete shimau (end up eating) |

| te iku | gradually go on doing | fuete iku (keeps increasing) |

| te kuru | gradually come to be | samuku natte kuru (getting cold) |

te iru in particular has two meanings and needs care.

tabete iru. (is eating) → progressive

kekkon shite iru. (is married) → state (not progressive!)

shinde iru. (is dead) → state

Action verbs express "progressive," while instantaneous verbs (kekkon suru, shinu) express "the resulting state." This is a classic spot where the nuance diverges from the Korean "-go itda."

Giving/Receiving Expressions and the te-form

Giving/receiving verbs (ageru, kureru, morau) also combine with the te-form to make "do for someone."

oshiete ageru. (teach for someone — I to another)

oshiete kureru. (teach for me — another to me)

oshiete morau. (have it taught = another does it for me)

The verb changing with direction differs from Korean. Korean handles it with a single "teach for," but Japanese distinguishes ageru, kureru, and morau depending on who benefits whom.

Conjugating Adjectives and Nouns Too

Just as common as verbs is the conjugation of adjectives and nouns. Let us organize them so they are not confused with verb conjugation.

| --- | --- | --- | --- | --- |

The i-adjective's ending "i" changes to katta/kunai/kute, while na-adjectives and nouns change "da" to datta/dewa nai/de. Only by acquiring these three conjugations alongside verbs can you build sentences freely.

Suggested Learning Order

An efficient order for acquiring verb conjugation.

1. **Group identification**: be able to instantly tell Groups 1/2/3 from the dictionary form alone.

2. **masu-form, nai-form**: the most frequently used polite and negative forms.

3. **te-form**: fully automate the sound-change rules. This is the biggest hurdle.

4. **ta-form**: auto-derived from the te-form.

5. **Potential, volitional**: essential for daily conversation.

6. **Conditional, imperative**: situational.

7. **Passive, causative**: intermediate-and-beyond depth.

The te-form in particular is effective to memorize as a rhythm, like a song: "u-tsu-ru → tte, mu-bu-nu → nde, ku → ite, gu → ide, su → shite." In fact, singing this rule is a widely used learning method among Japanese learners.

Common Mistakes

| Mistake | Correct form | Explanation |

| --- | --- | --- |

| Conjugating kaeru as Group 2 | kaette (O), kaete (X) | kaeru is an exception Group 1 |

| te-form of iku as iite | itte (O) | iku has an irregular te-form |

| nai-form of kau as kaanai | kawanai (O) | u → wa change |

| Confusing kuru readings | konai=konai, kite | kuru's reading shifts per conjugation |

kuru shifts its reading per conjugation (kuru, konai, kite, koyou), so it needs special care.

Conclusion

Japanese verb conjugation is mostly solved by two steps: "identify the group → apply the rule." The burden is far lighter than memorizing English irregular verbs wholesale. The key is automating the Group 1 te-form sound changes. Clear that and the ta-form comes free, and the remaining forms can be built from combinations of rules.

At first you will convert each form while looking at the table, but with repetition the moment comes when all forms spring to mind from the dictionary form alone. When you reach that stage, your speed at building Japanese sentences increases dramatically.

References

- [JLPT Official Site](https://www.jlpt.jp/)

- [goo Dictionary - Japanese dictionary](https://dictionary.goo.ne.jp/)

- [NHK for School - Language](https://www.nhk.or.jp/school/)

- [Tofugu - Japanese Verb Conjugation](https://www.tofugu.com/japanese/)

- [Imabi - Japanese Grammar](https://www.imabi.net/)

- [Agency for Cultural Affairs - Japanese Language Policy](https://www.bunka.go.jp/kokugo_nihongo/)