有力 (yuuryoku) conjugation
influence, prominence; potent
有力 (ゆうりょく, yuuryoku) 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 | 有力だ yuuryokuda | 有力です yuuryokudesu | The form you look up. Also the casual “is ~”. |
| Negative | 有力じゃない yuuryokujanai | 有力じゃないです yuuryokujanaidesu | “is not ~”. |
| Past | 有力だった yuuryokudatta | 有力でした yuuryokudeshita | “was ~”. |
| Past negative | 有力じゃなかった yuuryokujanakatta | 有力じゃなかったです yuuryokujanakattadesu | “was not ~”. |
| Te-form | 有力で yuuryokude | — | Links to the next clause: “~ and …”. |
| Adverb | 有力に yuuryokuni | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 有力な〜 yuuryokuna〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 有力なら yuuryokunara | — | “if it is ~”. |
| Conditional (~たら) | 有力だったら yuuryokudattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 有力になる yuuryokuninaru | 有力になります yuuryokuninarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 有力すぎる yuuryokusugiru | 有力すぎます yuuryokusugimasu | “too ~”. |
| Looks ~ (~そう) | 有力そう yuuryokusou | 有力そうです yuuryokusoudesu | “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.