良好 (ryoukou) conjugation
favorable, satisfactory
良好 (りょうこう, ryoukou) 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 | 良好だ ryoukouda | 良好です ryoukoudesu | The form you look up. Also the casual “is ~”. |
| Negative | 良好じゃない ryoukoujanai | 良好じゃないです ryoukoujanaidesu | “is not ~”. |
| Past | 良好だった ryoukoudatta | 良好でした ryoukoudeshita | “was ~”. |
| Past negative | 良好じゃなかった ryoukoujanakatta | 良好じゃなかったです ryoukoujanakattadesu | “was not ~”. |
| Te-form | 良好で ryoukoude | — | Links to the next clause: “~ and …”. |
| Adverb | 良好に ryoukouni | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 良好な〜 ryoukouna〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 良好なら ryoukounara | — | “if it is ~”. |
| Conditional (~たら) | 良好だったら ryoukoudattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 良好になる ryoukouninaru | 良好になります ryoukouninarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 良好すぎる ryoukousugiru | 良好すぎます ryoukousugimasu | “too ~”. |
| Looks ~ (~そう) | 良好そう ryoukousou | 良好そうです ryoukousoudesu | “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.