正確 (seikaku) conjugation
accurate, punctuality, exact
正確 (せいかく, seikaku) 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 | 正確だ seikakuda | 正確です seikakudesu | The form you look up. Also the casual “is ~”. |
| Negative | 正確じゃない seikakujanai | 正確じゃないです seikakujanaidesu | “is not ~”. |
| Past | 正確だった seikakudatta | 正確でした seikakudeshita | “was ~”. |
| Past negative | 正確じゃなかった seikakujanakatta | 正確じゃなかったです seikakujanakattadesu | “was not ~”. |
| Te-form | 正確で seikakude | — | Links to the next clause: “~ and …”. |
| Adverb | 正確に seikakuni | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 正確な〜 seikakuna〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 正確なら seikakunara | — | “if it is ~”. |
| Conditional (~たら) | 正確だったら seikakudattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 正確になる seikakuninaru | 正確になります seikakuninarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 正確すぎる seikakusugiru | 正確すぎます seikakusugimasu | “too ~”. |
| Looks ~ (~そう) | 正確そう seikakusou | 正確そうです seikakusoudesu | “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.