平ら (taira) conjugation
flatness, level, smooth
平ら (たいら, taira) 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 | 平らだ tairada | 平らです tairadesu | The form you look up. Also the casual “is ~”. |
| Negative | 平らじゃない tairajanai | 平らじゃないです tairajanaidesu | “is not ~”. |
| Past | 平らだった tairadatta | 平らでした tairadeshita | “was ~”. |
| Past negative | 平らじゃなかった tairajanakatta | 平らじゃなかったです tairajanakattadesu | “was not ~”. |
| Te-form | 平らで tairade | — | Links to the next clause: “~ and …”. |
| Adverb | 平らに tairani | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 平らな〜 tairana〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 平らなら tairanara | — | “if it is ~”. |
| Conditional (~たら) | 平らだったら tairadattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 平らになる tairaninaru | 平らになります tairaninarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 平らすぎる tairasugiru | 平らすぎます tairasugimasu | “too ~”. |
| Looks ~ (~そう) | 平らそう tairasou | 平らそうです tairasoudesu | “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.