Understanding Japanese Verb Groups
Japanese verbs are categorized into three main groups: ichidan (一段動詞), godan (五段動詞), and irregular verbs (不規則動詞). Mastering these groups is essential because conjugation rules differ for each, affecting how you form present, past, negative, and polite forms. This guide will help you identify and conjugate verbs from each group with confidence.
Ichidan Verbs (一段動詞 / Ru-verbs)
Ichidan verbs, often called "ru-verbs," are generally easier to conjugate because they follow a consistent pattern. The name "ichidan" means "one-step," indicating that you only need to remove the "-ru" ending and add the desired suffix.
How to Identify Ichidan Verbs
Most ichidan verbs end in "-iru" (いる) or "-eru" (える). However, there are exceptions—some verbs ending this way are actually godan verbs, so it's important to memorize common ones.
Tip: A helpful clue: if the verb stem (the part before "-ru") is a word by itself or can be written in kanji, it's often ichidan. For example, 食 (ta) from 食べる means "eat."
Basic Conjugation Patterns for Ichidan Verbs
To conjugate, remove the "-ru" and add the appropriate ending.
| Form | Rule | Example: 食べる (taberu) |
|---|---|---|
| Plain Present | Remove る | 食べる |
| Plain Negative | Remove る + ない | 食べない |
| Plain Past | Remove る + た | 食べた |
| Polite Present | Remove る + ます | 食べます |
| Polite Negative | Remove る + ません | 食べません |
| Te-form | Remove る + て | 食べて |
Godan Verbs (五段動詞 / U-verbs)
Godan verbs, or "u-verbs," are more varied and change their ending vowel sound depending on the conjugation. "Godan" means "five-step," referring to the five vowel sounds (-a, -i, -u, -e, -o) the verb endings can take.
How to Identify Godan Verbs
Godan verbs end in a consonant + "u" sound. Common endings include -ku, -su, -tsu, -nu, -mu, -gu, -bu, and -ru. Remember: some verbs ending in "-iru" or "-eru" are godan, not ichidan!
Warning: Some common verbs that end in "-iru" or "-eru" are actually godan verbs, such as 帰る (kaeru, to return) and 切る (kiru, to cut). These must be memorized.
Basic Conjugation Patterns for Godan Verbs
Conjugation involves changing the final "u" sound to one of the five vowel endings. Here’s a general table for godan verbs:
| Form | Rule | Example: 書く (kaku) |
|---|---|---|
| Plain Present | Dictionary form | 書く |
| Plain Negative | Change u to a + nai | 書かない |
| Plain Past | Change u to i + ta | 書いた |
| Polite Present | Change u to i + masu | 書きます |
| Polite Negative | Change u to i + masen | 書きません |
| Te-form | Varies by ending* | 書いて |
*Te-form rules for godan verbs depend on the final consonant: -u/tsu/ru → tte; -mu/bu/nu → nde; -ku → ite; -gu → ide; -su → shite.
Irregular Verbs (不規則動詞)
There are only two truly irregular verbs in Japanese: する (suru, to do) and 来る (kuru, to come). They don’t follow the patterns of ichidan or godan verbs and must be memorized individually.
Conjugation of する (suru)
| Form | Conjugation |
|---|---|
| Plain Present | する |
| Plain Negative | しない |
| Plain Past | した |
| Polite Present | します |
| Polite Negative | しません |
| Te-form | して |
Conjugation of 来る (kuru)
| Form | Conjugation |
|---|---|
| Plain Present | 来る (kuru) |
| Plain Negative | 来ない (konai) |
| Plain Past | 来た (kita) |
| Polite Present | 来ます (kimasu) |
| Polite Negative | 来ません (kimasen) |
| Te-form | 来て (kite) |
Practice Identifying Verb Groups
Practice
Try categorizing these verbs into ichidan, godan, or irregular groups. Check a dictionary if unsure!
- 遊ぶ (asobu, to play)
- 寝る (neru, to sleep)
- 走る (hashiru, to run)
- 勉強する (benkyō suru, to study)
- 買う (kau, to buy)
Answers: 遊ぶ (godan), 寝る (ichidan), 走る (godan), 勉強する (irregular), 買う (godan).
Key Takeaways
- Ichidan verbs end in -iru or -eru (with exceptions) and conjugate by removing -ru.
- Godan verbs end in a consonant + u and change their final vowel sound when conjugated.
- Only two irregular verbs: する and 来る—memorize their conjugations.
- Watch out for godan verbs that look like ichidan (e.g., 帰る、切る).
- Practice with real examples and use conjugation tables as a reference.
With consistent practice, identifying and conjugating Japanese verbs will become second nature. Keep reviewing these groups, and soon you’ll be able to handle verbs effortlessly!