大丈夫 (daijoubu) conjugation
It's ok (all right); No need to worry; Everything is under control
大丈夫 (だいじょうぶ, daijoubu) 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 | 大丈夫だ daijoubuda | 大丈夫です daijoubudesu | The form you look up. Also the casual “is ~”. |
| Negative | 大丈夫じゃない daijoubujanai | 大丈夫じゃないです daijoubujanaidesu | “is not ~”. |
| Past | 大丈夫だった daijoubudatta | 大丈夫でした daijoubudeshita | “was ~”. |
| Past negative | 大丈夫じゃなかった daijoubujanakatta | 大丈夫じゃなかったです daijoubujanakattadesu | “was not ~”. |
| Te-form | 大丈夫で daijoubude | — | Links to the next clause: “~ and …”. |
| Adverb | 大丈夫に daijoubuni | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 大丈夫な〜 daijoubuna〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 大丈夫なら daijoubunara | — | “if it is ~”. |
| Conditional (~たら) | 大丈夫だったら daijoubudattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 大丈夫になる daijoubuninaru | 大丈夫になります daijoubuninarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 大丈夫すぎる daijoubusugiru | 大丈夫すぎます daijoubusugimasu | “too ~”. |
| Looks ~ (~そう) | 大丈夫そう daijoubusou | 大丈夫そうです daijoubusoudesu | “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.