的確 (tekikaku) conjugation
precise, accurate
的確 (てきかく, tekikaku) 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 | 的確だ tekikakuda | 的確です tekikakudesu | The form you look up. Also the casual “is ~”. |
| Negative | 的確じゃない tekikakujanai | 的確じゃないです tekikakujanaidesu | “is not ~”. |
| Past | 的確だった tekikakudatta | 的確でした tekikakudeshita | “was ~”. |
| Past negative | 的確じゃなかった tekikakujanakatta | 的確じゃなかったです tekikakujanakattadesu | “was not ~”. |
| Te-form | 的確で tekikakude | — | Links to the next clause: “~ and …”. |
| Adverb | 的確に tekikakuni | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 的確な〜 tekikakuna〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 的確なら tekikakunara | — | “if it is ~”. |
| Conditional (~たら) | 的確だったら tekikakudattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 的確になる tekikakuninaru | 的確になります tekikakuninarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 的確すぎる tekikakusugiru | 的確すぎます tekikakusugimasu | “too ~”. |
| Looks ~ (~そう) | 的確そう tekikakusou | 的確そうです tekikakusoudesu | “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.