有能 (yuunou) conjugation
able, capable, efficient
有能 (ゆうのう, yuunou) 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 | 有能だ yuunouda | 有能です yuunoudesu | The form you look up. Also the casual “is ~”. |
| Negative | 有能じゃない yuunoujanai | 有能じゃないです yuunoujanaidesu | “is not ~”. |
| Past | 有能だった yuunoudatta | 有能でした yuunoudeshita | “was ~”. |
| Past negative | 有能じゃなかった yuunoujanakatta | 有能じゃなかったです yuunoujanakattadesu | “was not ~”. |
| Te-form | 有能で yuunoude | — | Links to the next clause: “~ and …”. |
| Adverb | 有能に yuunouni | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 有能な〜 yuunouna〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 有能なら yuunounara | — | “if it is ~”. |
| Conditional (~たら) | 有能だったら yuunoudattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 有能になる yuunouninaru | 有能になります yuunouninarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 有能すぎる yuunousugiru | 有能すぎます yuunousugimasu | “too ~”. |
| Looks ~ (~そう) | 有能そう yuunousou | 有能そうです yuunousoudesu | “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.