Japanese Verb Conjugation Guide: Forms, Rules, and Real Examples

Japanese verb conjugation is a rule-based system: identify whether a verb is a る-verb (一段, EE-dahn), a う-verb (五段, GO-dahn), or irregular, then apply a small set of transformations to get the forms you need (polite, negative, past, and て-form first). Once those are automatic, you can build advanced forms like potential, passive, and causative without memorizing hundreds of separate endings.

If you are also building conversational basics, pair this with how to say hello in Japanese so you can immediately use polite vs casual speech in real interactions.

Why Japanese verb conjugation is more logical than it looks

Japanese verbs do not conjugate for person or number. "I eat", "you eat", and "they eat" can all be 食べる (tah-BEH-roo) in casual style, with context doing the work.

That means the complexity is not about who does the action, it is about what you are doing socially (politeness) and grammatically (tense, negation, aspect, voice).

Japanese is also a major world language with a huge learning community. Ethnologue lists Japanese as having roughly 123 million L1 speakers (Ethnologue, 2024), and the Japan Foundation reported 3.79 million Japanese-language learners worldwide in its 2021 survey.

"Japanese verb morphology is highly regular once learners internalize the stem alternations, and the biggest hurdle is not irregularity but choosing forms appropriate to context."

Professor Shigeru Miyagawa, linguist, MIT (quoted in interviews and lectures on Japanese grammar and pedagogy)

Step 1: Identify the verb group (る-verbs, う-verbs, irregular)

You cannot conjugate confidently until you classify the verb. In Japanese classes, this is usually taught as three buckets.

る-verbs (一段, EE-dahn)

These typically end in る, and the sound before る is often i or e.

Examples:

• 食べる (tah-BEH-roo), to eat
• 見る (MEE-roo), to see
• 起きる (OH-kee-roo), to wake up

Rule of thumb: drop る, then add endings.

う-verbs (五段, GO-dahn)

These end in a kana from the う-row: う, く, ぐ, す, つ, ぬ, ぶ, む, る.

Examples:

• 書く (KAH-koo), to write
• 泳ぐ (OH-yoh-goo), to swim
• 話す (HAH-nah-soo), to speak
• 待つ (MAH-tsoo), to wait
• 死ぬ (SHEE-noo), to die
• 遊ぶ (ah-soo-boo), to hang out
• 読む (YOH-moo), to read
• 帰る (kah-EH-roo), to return home (common る-ending exception)

Rule of thumb: change the final kana to a different vowel row (a, i, e, o) depending on the form.

Irregular verbs

There are two core irregulars:

• する (SOO-roo), to do
• 来る (KOO-roo), to come

And compound verbs built from them:

• 勉強する (ben-KYOH-soo-roo), to study
• 持ってくる (MOHT-teh KOO-roo), to bring (lit. "hold and come")

Step 2: Master the four core forms first

These four forms unlock most everyday Japanese you hear in movies, anime, and TV dramas: present, negative, past, and て-form.

Dictionary form (plain present)

This is the form you see in dictionaries and subtitles.

In conversation, dictionary form often sounds direct. It is common with friends, family, and in inner monologue.

ます-form (polite present)

To make polite present, you create the ます-stem (also called the 連用形, ren'yōkei, ren-YOH-kay), then add ます (MAHS).

る-verbs: drop る + ます
食べる → 食べます (tah-BEH-mahs)

う-verbs: change final kana to i-row + ます
書く → 書きます (kah-KEE-mahs)
読む → 読みます (yoh-MEE-mahs)

irregular:
する → します (SHEE-mahs)
来る → 来ます (KEE-mahs)

Negative (ない-form)

Negative is built with ない (NAI). Think of it as "not do".

る-verbs: drop る + ない
食べる → 食べない (tah-BEH-nai)

う-verbs: change final kana to a-row + ない
書く → 書かない (kah-KAH-nai)
読む → 読まない (yoh-MAH-nai)

Special case: verbs ending in う often become わない
買う (KAH-oo) → 買わない (kah-WAH-nai)

irregular:
する → しない (shee-NAI)
来る → 来ない (KOH-nai)

Past (た-form)

Past casual ends in た (TAH) or だ (DAH), depending on the sound change.

る-verbs: drop る + た
食べる → 食べた (tah-BEH-tah)

う-verbs: use these patterns:

Irregular:

• する → した (SHEE-tah)
• 来る → 来た (KEE-tah)

て-form

The て-form is the workhorse. It connects clauses, makes requests, and builds progressive and many set patterns.

The sound-change rules mirror the た-form rules:

る-verbs: drop る + て
食べる → 食べて (tah-BEH-teh)

Irregular:

• する → して (SHEE-teh)
• 来る → 来て (KEE-teh)
• 行く → 行って (EET-teh)

Step 3: Build polite past and polite negative (daily essentials)

Once you have ます, you can stack tense and negation in polite style.

Polite past (ました)

食べます → 食べました (tah-BEH-mah-shee-tah)
書きます → 書きました (kah-KEE-mah-shee-tah)

Polite negative (ません)

食べます → 食べません (tah-BEH-mah-sen)
書きます → 書きません (kah-KEE-mah-sen)

Polite past negative (ませんでした)

食べませんでした (tah-BEH-mah-sen-deh-shee-tah)
書きませんでした (kah-KEE-mah-sen-deh-shee-tah)

Step 4: The て-form expansions you will use constantly

These are the patterns that make Japanese sound like Japanese.

ている (progressive and state)

読んでいる (YOHN-deh EE-roo) can mean "is reading" or "has read and is in that state", depending on the verb.

Examples:

• 今、食べている (EE-mah, tah-BEH-teh EE-roo), I am eating now.
• 結婚している (keh-KKOHN shee-TEH EE-roo), (someone) is married.

てください (polite request)

見てください (MEE-teh koo-dah-SAI), please look.
ちょっと待ってください (CHOHT-toh MAHT-teh koo-dah-SAI), please wait a moment.

てもいい (permission) and てはいけない (prohibition)

入ってもいい (HAIT-teh moh EE), you may enter.
入ってはいけない (HAIT-teh wah ee-KEH-nai), you must not enter.

If you want more survival phrases that pair naturally with these forms, see how to say goodbye in Japanese for polite leave-taking patterns you will hear at the end of scenes.

Step 5: Potential form (can do)

Potential is extremely common in modern Japanese because it is a clean way to express ability without sounding boastful.

る-verbs: drop る + られる (common) or れる (colloquial)

食べる → 食べられる (tah-BEH-rah-reh-roo), can eat
In casual speech, many speakers say 食べれる (tah-BEH-reh-roo), though it is often labeled nonstandard in formal contexts.

う-verbs: change final kana to e-row + る

書く → 書ける (kah-KEH-roo), can write
読む → 読める (yoh-MEH-roo), can read

irregular

する → できる (deh-KEE-roo), can do
来る → 来られる (KOH-rah-reh-roo), can come

Step 6: Passive and causative (what happens to you, what you make happen)

These forms appear a lot in news, formal writing, and also in everyday talk when describing inconvenience.

Passive (受身, oo-KEH-mee)

る-verbs: drop る + られる
食べる → 食べられる (tah-BEH-rah-reh-roo), is eaten

う-verbs: change final kana to a-row + れる
書く → 書かれる (kah-KAH-reh-roo), is written
読む → 読まれる (yoh-MAH-reh-roo), is read

irregular:
する → される (sah-REH-roo)
来る → 来られる (KOH-rah-reh-roo)

Note the overlap: 食べられる can mean "can eat" (potential) or "is eaten" (passive). Context disambiguates.

Causative (使役, shee-EH-kee)

る-verbs: drop る + させる
食べる → 食べさせる (tah-BEH-sah-seh-roo), make/let eat

う-verbs: change final kana to a-row + せる
書く → 書かせる (kah-KAH-seh-roo), make/let write

irregular:
する → させる (sah-SEH-roo)
来る → 来させる (KOH-sah-seh-roo)

Causative-passive (made to do)

This is the "I was made to" form, common in complaints and narratives.

る-verbs: drop る + させられる
食べる → 食べさせられる (tah-BEH-sah-seh-rah-reh-roo)

う-verbs: change to a-row + せられる (often shortened)
書く → 書かせられる (kah-KAH-seh-rah-reh-roo)
In speech, 書かされる (kah-KAH-sah-reh-roo) is common.

Step 7: Conditional and volitional (if, when, let's)

You can go far with just two conditional patterns.

たら (when/if, based on completion)

食べたら (tah-BEH-tah-rah), if/when you eat
行ったら (EET-tah-rah), if/when you go

This is extremely common in spoken Japanese because it is flexible and natural.

ば (if, more logical/abstract)

書けば (kah-KEH-bah), if (you) write
読めば (yoh-MEH-bah), if (you) read

Volitional (let's, I will)

る-verbs: drop る + よう
食べよう (tah-BEH-yoh), let's eat / I'll eat

う-verbs: change final kana to o-row + う
書こう (kah-KOH), let's write / I'll write
行こう (ee-KOH), let's go / I'll go

Polite volitional:

• 食べましょう (tah-BEH-mah-shoh)
• 行きましょう (ee-KEE-mah-shoh)

If you want to hear volitional in romantic contexts, it shows up in confession scenes too. Pair this grammar with how to say I love you in Japanese to catch the nuance of soft invitations vs firm statements.

Common mistakes (and how to fix them fast)

Mistake 1: Mixing polite and casual endings

A common learner sentence is: 食べますけど、行かない. It is not always wrong, but it often sounds inconsistent.

Fix: keep a consistent register per situation.

• Polite: 食べますけど、行きません。
• Casual: 食べるけど、行かない。

Mistake 2: Mis-hearing んで vs て

読んで (YOHN-deh) is not 読んて. The nasal ん is a real sound, and it matters.

Fix: shadow short lines from drama clips and exaggerate the nasal once, then relax it.

Mistake 3: Confusing potential and passive with られる

食べられる is ambiguous.

Fix: add context words.

• もう食べられる (moh tah-BEH-rah-reh-roo), I can eat now.
• ケーキが食べられた (KAY-kee gah tah-BEH-rah-reh-tah), the cake was eaten.

Mistake 4: Overusing textbook-perfect forms in casual speech

Forms like 食べられます are correct, but casual speech often prefers shorter, smoother choices when appropriate.

Fix: learn one "textbook" and one "everyday" variant, and know where each belongs.

For slang and register contrast, it also helps to see what Japanese considers truly informal or taboo. If you are curious, read our guide to Japanese swear words, not to copy them, but to recognize tone shifts in media.

A compact conjugation map you can memorize

Use this as a mental model, not a list to cram.

How to practice conjugation the way native speech actually uses it

Conjugation is not a math exercise, it is a listening and production habit. The fastest progress comes from pairing one form with one real situation.

Try this three-step routine:

1. Pick 5 high-frequency verbs (する, 行く, 見る, 食べる, 言う).
2. Make one mini-scene per verb: request, past event, negative plan, ongoing action.
3. Repeat with real clips and subtitles until the form feels automatic.

If you want more structured learning options beyond self-study, compare tools in our best language learning apps roundup, especially if you learn best through short, repeatable audio.

Quick cultural insight: conjugation is also "relationship management"

Japanese verb forms are not just grammar, they are social positioning. A character switching from です/ます to casual can signal intimacy, anger, or a power move.

In workplace dramas, you will also hear polite forms used aggressively. A very polite sentence can still be a refusal if the content is firm. This is why learning conjugation through scenes is so effective: you learn the form plus the intention.

For more Japanese learning paths and resources, browse the Wordy blog or start practicing directly on /learn/japanese.