正常 (seijou) conjugation
normalcy, normality, normal
正常 (せいじょう, seijou) 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 | 正常だ seijouda | 正常です seijoudesu | The form you look up. Also the casual “is ~”. |
| Negative | 正常じゃない seijoujanai | 正常じゃないです seijoujanaidesu | “is not ~”. |
| Past | 正常だった seijoudatta | 正常でした seijoudeshita | “was ~”. |
| Past negative | 正常じゃなかった seijoujanakatta | 正常じゃなかったです seijoujanakattadesu | “was not ~”. |
| Te-form | 正常で seijoude | — | Links to the next clause: “~ and …”. |
| Adverb | 正常に seijouni | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 正常な〜 seijouna〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 正常なら seijounara | — | “if it is ~”. |
| Conditional (~たら) | 正常だったら seijoudattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 正常になる seijouninaru | 正常になります seijouninarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 正常すぎる seijousugiru | 正常すぎます seijousugimasu | “too ~”. |
| Looks ~ (~そう) | 正常そう seijousou | 正常そうです seijousoudesu | “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.