Every Japanese verb has a dictionary form (also called the plain form or u-form), and it is the single most important form to learn. It is the form listed in dictionaries, used in casual speech, and the base from which all other conjugations are built. If you have been confused about how verb forms relate to each other, this guide will give you a clear, complete picture.
| Feature | Detail |
|---|---|
| Also called | Plain form, u-form, basic form, non-past plain form |
| Used for | Dictionaries, casual speech, noun modification, sentence embedding |
| Verb groups | Group 1 (u-verbs / godan), Group 2 (ru-verbs / ichidan), Group 3 (irregular) |
| Ends in | One of: う, く, ぐ, す, つ, ぬ, ぶ, む, る (u-row of hiragana or る) |
| JLPT relevance | N5 (core concept); N4/N3 builds on it for all grammar patterns |
YukaThe dictionary form is your starting point for everything. Once you know a verb’s dictionary form, you can build the masu-form, te-form, nai-form, ta-form — all of them. Think of it as the ‘root word’ in Japanese.
The Three Verb Groups and Their Dictionary Forms
Japanese verbs divide into three groups based on how they conjugate. Knowing which group a verb belongs to is essential for forming the dictionary form correctly.
| Group | Common Name | Dictionary Form Pattern | Examples |
|---|---|---|---|
| Group 1 | u-verbs / godan | Ends in a u-row sound (く, ね, む, る, etc.) | 凱く (kaku), 螚む (nomu), 読む (yomu), 週う (au) |
| Group 2 | ru-verbs / ichidan | Ends in る preceded by an e or i sound | 験べる (taberu), 見る (miru), 起きる (okiru) |
| Group 3 | Irregular | Must be memorized; only two verbs | する (suru, do), くる (kuru, come) |
Important warning for learners: Some verbs that look like ru-verbs are actually u-verbs. For example, 入る (hairu, to enter), 知る (shiru, to know), and 返る (kaeru, to return) end in る but are u-verbs (Group 1). When in doubt, check a dictionary.
Dictionary Form in Casual Speech
In casual (plain-style) conversation, the dictionary form is used at the end of sentences instead of the ます (masu) form. This is the speech style used among close friends and family.
| Polite (masu form) | Casual (dictionary form) | English |
|---|---|---|
| 今日は験べます。 | 今日は験べる。 | Today I will eat. |
| 日本語を4…や読みます。 | 日本語を4…や読む。 | I study Japanese. |
| 昼起きます。 | 昼起きる。 | I wake up early. |
| 金来日に融ます。 | 金来日に遘める。 | It will rain on Friday. |
| 明日、高村さんに会います。 | 明日、高村に会う。 | I will meet Takagi-san tomorrow. |
ReiSwitching between masu-form and plain-form is one of the biggest shifts when you go from textbook Japanese to real-life Japanese. In anime, manga, and casual conversations, you will hear almost entirely plain-form speech. Getting comfortable with it is key to sounding natural.
Dictionary Form for Noun Modification (Relative Clauses)
One of the most important uses of the dictionary form is modifying nouns — placing a verb clause directly before a noun to describe it. In English, this is done with “that/which/who” relative clauses. In Japanese, the verb comes directly before the noun in its dictionary (or past) form.
| Japanese | Romaji | English |
|---|---|---|
| 私が験べる料理 | watashi ga taberu ryōri | the dish that I eat / the dish I’m going to eat |
| 左に目る人 | hidari ni miru hito | the person looking to the left |
| 已知る辞 | jibun ga shiru kotoba | words that I know |
| 先に起きる人 | saki ni okiru hito | the person who gets up first |
| 山を歯る月 | yama wo koeru tsuki | the moon that crosses the mountain |
Dictionary Form Before Grammar Patterns
Dozens of grammar patterns attach directly to the dictionary form. Here are the most important N5–N4 patterns you must know:
| Pattern | Meaning | Example | Translation |
|---|---|---|---|
| Dictionary + ことができる | can do ~ | 持つことができる | can carry |
| Dictionary + つもり | intend to ~ | 螚むつもり | intend to drink |
| Dictionary + 前に | before doing ~ | 験べる前に | before eating |
| Dictionary + ために | in order to ~ | 努御するために | in order to study |
| Dictionary + ことがある | have experienced ~ | 遺みたことがある | have experienced choosing |
| Dictionary + ようになる | come to be able to ~ | 読むようになった | came to be able to read |
YukaA huge shortcut for N4 study: whenever you see a grammar pattern like つもり, 前に, ために, they almost always attach to the dictionary form. If you remember ‘dictionary form + grammar pattern’ as a chunk, reading new patterns becomes much faster.
Common Mistakes with Dictionary Form
These are the most frequent errors English speakers make when using the dictionary form.
| Mistake | Wrong | Correct | Why |
|---|---|---|---|
| Using masu-form before noun | 験べます料理 | 験べる料甔 | Nouns require dictionary form (or past form), not masu-form |
| Confusing u-verbs ending in る | 入る treated as ru-verb | hairu is a u-verb | Must check group; appearance can be deceptive |
| Omitting こと in ability expression | 読むできる | 読むことができる | こと is required as the nominalizer |
Quick Quiz
1. What is the dictionary form of 切った (kitta, cut, past tense)?
→ 切る (kiru)
2. Fill in: �;前には水を___(螚む)ことが大事です。 (Before bed, drinking water is important.)
→ 螚む (dictionary form before こと)
3. Is 知る (shiru) a Group 1 (u-verb) or Group 2 (ru-verb)?
→ Group 1 (u-verb) — it looks like a ru-verb but conjugates as godan
4. What does dictionary form + 前に mean?
→ Before doing ~
5. Change to casual speech: 日本語を努御します。
→ 日本語を努御する。
Want to practice verb conjugation with a native speaker? Find a Japanese tutor on italki and drill all the forms in real conversation.
Which verb group do you find most confusing? Or do you have tips for remembering which verbs are “tricky” u-verbs? Share in the comments — your insights help other learners!
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