重宝 (chouhou) conjugation
convenient, useful
重宝 (ちょうほう, chouhou) 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 | 重宝だ chouhouda | 重宝です chouhoudesu | The form you look up. Also the casual “is ~”. |
| Negative | 重宝じゃない chouhoujanai | 重宝じゃないです chouhoujanaidesu | “is not ~”. |
| Past | 重宝だった chouhoudatta | 重宝でした chouhoudeshita | “was ~”. |
| Past negative | 重宝じゃなかった chouhoujanakatta | 重宝じゃなかったです chouhoujanakattadesu | “was not ~”. |
| Te-form | 重宝で chouhoude | — | Links to the next clause: “~ and …”. |
| Adverb | 重宝に chouhouni | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 重宝な〜 chouhouna〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 重宝なら chouhounara | — | “if it is ~”. |
| Conditional (~たら) | 重宝だったら chouhoudattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 重宝になる chouhouninaru | 重宝になります chouhouninarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 重宝すぎる chouhousugiru | 重宝すぎます chouhousugimasu | “too ~”. |
| Looks ~ (~そう) | 重宝そう chouhousou | 重宝そうです chouhousoudesu | “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.