Introduction to Verb Conjugation
Japanese verbs change their form to express different meanings: tense, politeness, negation, and more. This is called conjugation (活用 - かつよう).
Here are the main conjugation forms you'll use every day:
- Dictionary (辞書形) — Base form, casual present: 食べる (taberu)
- Masu (ます形) — Polite present: たべます (tabemasu)
- Te (て形) — Connecting, requests: たべて (tabete)
- Ta (た形) — Past tense: たべた (tabeta)
- Nai (ない形) — Negative: たべない (tabenai)
Why Conjugation Matters
Unlike English where we add separate words ("I will go", "I don't go"), Japanese builds everything into the verb itself:
| English | Japanese | Form |
|---|---|---|
| I eat | 食べる | Dictionary |
| I eat (polite) | たべます | Masu |
| I ate | たべた | Ta |
| I don't eat | たべない | Nai |
| Eating... | たべて | Te |
The Three Verb Groups
Japanese verbs fall into three groups, each with different conjugation rules:
| Group | Japanese Name | Key Feature | Examples |
|---|---|---|---|
| Group 1 | 五段動詞 (godan) | End in う-sound | 書く, 話す, 読む |
| Group 2 | 一段動詞 (ichidan) | End in る | 食べる, 見る |
| Group 3 | 不規則動詞 (fukisoku) | Irregular | する, 来る |
Group 2 verbs are the easiest, they all follow the same simple pattern. Group 3 only has two verbs to memorize!
Why "Godan" and "Ichidan"?
The Japanese names describe how the verbs conjugate, not their order:
- Godan (五段) — "five levels": Uses all 5 vowel rows (あ, い, う, え, お) when conjugating
- Ichidan (一段) — "one level": Uses only 1 vowel pattern, just drop る
- Fukisoku (不規則) — "irregular": Doesn't follow standard patterns
Godan = "Five Levels": Take 書く (kaku). The stem changes through all 5 vowel columns:
| Vowel | Stem | Form |
|---|---|---|
| あ (a) | かか | nai-form → かかない |
| い (i) | かき | masu-form → かきます |
| う (u) | かく | dictionary form |
| え (e) | かけ | potential → かける |
| お (o) | かこ | volitional → かこう |
Ichidan = "One Level": Take 食べる (taberu). The stem never changes, always たべ:
- たべ + ます
- たべ + て
- たべ + た
- たべ + ない
The "Group 1, 2, 3" numbering is just a modern teaching convention, it's unrelated to the Japanese names. 五段 means "five levels" (not "first"), and 一段 means "one level" (not "second").
The Copula: です / だ
Japanese has a special word called the copula (です/だ) which means "to be" for nouns and adjectives. It's not a verb, but it conjugates similarly.
| Form | Polite | Casual | Meaning |
|---|---|---|---|
| Present | です (desu) | だ (da) | is/am/are |
| Past | でした (deshita) | だった (datta) | was/were |
| Negative | じゃないです / ではありません | じゃない | is not |
| Past Negative | じゃなかったです | じゃなかった | was not |
Examples
- がくせい です - I am a student (polite)
- がくせい だ - I am a student (casual)
- がくせい でした - I was a student (polite past)
- がくせい だった - I was a student (casual past)
- がくせい じゃない - I am not a student (casual negative)
- です/でした — Polite speech, formal situations, strangers
- だ/だった — Casual speech, friends, family, inner thoughts
- In casual speech, だ is often dropped entirely: がくせい？ (Are you a student?)
Next Steps
Once you're comfortable with this lesson, check out: