高価 (kouka) conjugation
high price
高価 (こうか, kouka) 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 | 高価だ koukada | 高価です koukadesu | The form you look up. Also the casual “is ~”. |
| Negative | 高価じゃない koukajanai | 高価じゃないです koukajanaidesu | “is not ~”. |
| Past | 高価だった koukadatta | 高価でした koukadeshita | “was ~”. |
| Past negative | 高価じゃなかった koukajanakatta | 高価じゃなかったです koukajanakattadesu | “was not ~”. |
| Te-form | 高価で koukade | — | Links to the next clause: “~ and …”. |
| Adverb | 高価に koukani | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 高価な〜 koukana〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 高価なら koukanara | — | “if it is ~”. |
| Conditional (~たら) | 高価だったら koukadattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 高価になる koukaninaru | 高価になります koukaninarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 高価すぎる koukasugiru | 高価すぎます koukasugimasu | “too ~”. |
| Looks ~ (~そう) | 高価そう koukasou | 高価そうです koukasoudesu | “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.