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Japanese verb同一 (douitsu) Conjugation
同一 (douitsu) means “identical, same, one and the same”. It is a な-adjective verb. It is a な-adjective: it takes な before a noun (同一な) and だ or です after it, so 同一だ, 同一でした, 同一に. Below is its conjugation in all 14 forms, plain and polite, the same forms the Japanese verb conjugation worksheets print in their answer keys.
- Meaning
- identical, same, one and the same
- Type
- な-adjective
- Dictionary form
- 同一
- Reading
- どういつ
- Romaji
- douitsu
- Negative
- 同一じゃない
- Past
- 同一だった
- Te-form
- 同一で
- Adverb
- 同一に
Basic forms
Present現在形・辞書形
| Plain | 同一だ |
|---|---|
| Plain negative | 同一じゃない / 同一ではない |
| Polite | 同一です |
| Polite negative | 同一じゃありません / 同一ではありません |
Past過去形・た形
| Plain | 同一だった |
|---|---|
| Plain negative | 同一じゃなかった / 同一ではなかった |
| Polite | 同一でした |
| Polite negative | 同一じゃありませんでした / 同一ではありませんでした |
Te-formて形
| Plain | 同一で |
|---|---|
| Plain negative | 同一じゃなくて / 同一ではなくて |
Can and if
Conditional (-ba)仮定形・ば
| Plain | 同一なら |
|---|---|
| Plain negative | 同一でなければ |
Conditional (-tara)たら
| Plain | 同一だったら |
|---|---|
| Plain negative | 同一じゃなかったら / 同一ではなかったら |
Adjectives
Adverb (adjectives)連用形
| Adverb | 同一に |
|---|
More common Japanese verbs and adjectives
- 世界的 (sekaiteki)worldwide, global, international
- 生きる (ikiru)to live, to exist
- 盛り込む (morikomu)to incorporate, to include
- 全面的 (zenmenteki)total, complete, all-out
- 単純 (tanjun)simple, plain, uncomplicated
- 適切 (tekisetsu)appropriate, suitable, fitting
- 特殊 (tokushu)special, particular, peculiar
- 秘密 (himitsu)secret, secrecy, confidentiality
- 不振 (fushin)dullness, slump, stagnation
- 不正 (fusei)injustice, unfairness, wrongdoing
- 不全 (fuzen)partial, incomplete, imperfect
- 不透明 (futoumei)opaque, obscure, murky
About these tables
The forms are built from Wiktionary's conjugation tables, and they are the ones the Japanese verb conjugation worksheet generator prints, so a chart or answer key made there matches this page. That page explains how the forms were checked.
Print this verb chart opens 同一 (douitsu) on the worksheet preview with every form filled in, ready to print on A4 or US Letter or save as PDF. To practice it with other verbs and adjectives, the generator also makes blank conjugation boxes and quick quizzes with answer keys. To practice online instead, the Japanese verb conjugation quiz marks each form as you type it.
Verbs, adjectives and their meanings come from JMdict, the property of the Electronic Dictionary Research and Development Group, used in conformance with the Group's licence. The forms are built by the standard rules, with the irregular ones written out.