一様 (ichiyou) conjugation
uniform, similar, equal
一様 (いちよう, ichiyou) is a na-adjective. Na-adjectives behave like nouns. The word itself never changes — you conjugate だ/です after it, and you need な to put it in front of a noun.
Conjugation table
| Form | Plain (casual) | Polite (~です) | When you use it |
|---|---|---|---|
| Dictionary / plain | 一様だ ichiyouda | 一様です ichiyoudesu | The form you look up. Also the casual “is ~”. |
| Negative | 一様じゃない ichiyoujanai | 一様じゃないです ichiyoujanaidesu | “is not ~”. |
| Past | 一様だった ichiyoudatta | 一様でした ichiyoudeshita | “was ~”. |
| Past negative | 一様じゃなかった ichiyoujanakatta | 一様じゃなかったです ichiyoujanakattadesu | “was not ~”. |
| Te-form | 一様で ichiyoude | — | Links to the next clause: “~ and …”. |
| Adverb | 一様に ichiyouni | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 一様な〜 ichiyouna〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 一様なら ichiyounara | — | “if it is ~”. |
| Conditional (~たら) | 一様だったら ichiyoudattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 一様になる ichiyouninaru | 一様になります ichiyouninarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 一様すぎる ichiyousugiru | 一様すぎます ichiyousugimasu | “too ~”. |
| Looks ~ (~そう) | 一様そう ichiyousou | 一様そうです ichiyousoudesu | “looks / seems ~” from appearance. |
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Why it conjugates this way
Na-adjectives behave like nouns. The word itself never changes — you conjugate だ/です after it, and you need な to put it in front of a noun.
See the full rules in the adjective conjugation guide.