便利 (benri) conjugation
convenient, handy
便利 (べんり, benri) 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 | 便利だ benrida | 便利です benridesu | The form you look up. Also the casual “is ~”. |
| Negative | 便利じゃない benrijanai | 便利じゃないです benrijanaidesu | “is not ~”. |
| Past | 便利だった benridatta | 便利でした benrideshita | “was ~”. |
| Past negative | 便利じゃなかった benrijanakatta | 便利じゃなかったです benrijanakattadesu | “was not ~”. |
| Te-form | 便利で benride | — | Links to the next clause: “~ and …”. |
| Adverb | 便利に benrini | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 便利な〜 benrina〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 便利なら benrinara | — | “if it is ~”. |
| Conditional (~たら) | 便利だったら benridattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 便利になる benrininaru | 便利になります benrininarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 便利すぎる benrisugiru | 便利すぎます benrisugimasu | “too ~”. |
| Looks ~ (~そう) | 便利そう benrisou | 便利そうです benrisoudesu | “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.