豊富 (houfu) conjugation
abundance, plenty
豊富 (ほうふ, houfu) 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 | 豊富だ houfuda | 豊富です houfudesu | The form you look up. Also the casual “is ~”. |
| Negative | 豊富じゃない houfujanai | 豊富じゃないです houfujanaidesu | “is not ~”. |
| Past | 豊富だった houfudatta | 豊富でした houfudeshita | “was ~”. |
| Past negative | 豊富じゃなかった houfujanakatta | 豊富じゃなかったです houfujanakattadesu | “was not ~”. |
| Te-form | 豊富で houfude | — | Links to the next clause: “~ and …”. |
| Adverb | 豊富に houfuni | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 豊富な〜 houfuna〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 豊富なら houfunara | — | “if it is ~”. |
| Conditional (~たら) | 豊富だったら houfudattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 豊富になる houfuninaru | 豊富になります houfuninarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 豊富すぎる houfusugiru | 豊富すぎます houfusugimasu | “too ~”. |
| Looks ~ (~そう) | 豊富そう houfusou | 豊富そうです houfusoudesu | “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.