暖かい (atatakai) conjugation
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暖かい (あたたかい, atatakai) is an i-adjective. I-adjectives carry their own tense: drop the final い and the endings attach straight to the stem. No だ, no です needed to make a complete sentence.
Conjugation table
| Form | Plain (casual) | Polite (~です) | When you use it |
|---|---|---|---|
| Dictionary / plain | 暖かい atatakai | 暖かいです atatakaidesu | The form you look up. Also the casual “is ~”. |
| Negative | 暖かくない atatakakunai | 暖かくないです atatakakunaidesu | “is not ~”. |
| Past | 暖かかった atatakakatta | 暖かかったです atatakakattadesu | “was ~”. |
| Past negative | 暖かくなかった atatakakunakatta | 暖かくなかったです atatakakunakattadesu | “was not ~”. |
| Te-form | 暖かくて atatakakute | — | Links to the next clause: “~ and …”. |
| Adverb | 暖かく atatakaku | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 暖かい〜 atatakai〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 暖かければ atatakakereba | — | “if it is ~”. |
| Conditional (~たら) | 暖かかったら atatakakattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 暖かくなる atatakakunaru | 暖かくなります atatakakunarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 暖かすぎる atatakasugiru | 暖かすぎます atatakasugimasu | “too ~”. |
| Looks ~ (~そう) | 暖かそう atatakasou | 暖かそうです atatakasoudesu | “looks / seems ~” from appearance. |
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Why it conjugates this way
I-adjectives carry their own tense: drop the final い and the endings attach straight to the stem. No だ, no です needed to make a complete sentence.
See the full rules in the adjective conjugation guide.