急 (kyuu) conjugation
urgent, sudden; steep
急 (きゅう, kyuu) 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 | 急だ kyuuda | 急です kyuudesu | The form you look up. Also the casual “is ~”. |
| Negative | 急じゃない kyuujanai | 急じゃないです kyuujanaidesu | “is not ~”. |
| Past | 急だった kyuudatta | 急でした kyuudeshita | “was ~”. |
| Past negative | 急じゃなかった kyuujanakatta | 急じゃなかったです kyuujanakattadesu | “was not ~”. |
| Te-form | 急で kyuude | — | Links to the next clause: “~ and …”. |
| Adverb | 急に kyuuni | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 急な〜 kyuuna〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 急なら kyuunara | — | “if it is ~”. |
| Conditional (~たら) | 急だったら kyuudattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 急になる kyuuninaru | 急になります kyuuninarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 急すぎる kyuusugiru | 急すぎます kyuusugimasu | “too ~”. |
| Looks ~ (~そう) | 急そう kyuusou | 急そうです kyuusoudesu | “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.