古い (furui) conjugation
old (in reference to objects, not people), aged, ancient
古い (ふるい, furui) 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 | 古い furui | 古いです furuidesu | The form you look up. Also the casual “is ~”. |
| Negative | 古くない furukunai | 古くないです furukunaidesu | “is not ~”. |
| Past | 古かった furukatta | 古かったです furukattadesu | “was ~”. |
| Past negative | 古くなかった furukunakatta | 古くなかったです furukunakattadesu | “was not ~”. |
| Te-form | 古くて furukute | — | Links to the next clause: “~ and …”. |
| Adverb | 古く furuku | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 古い〜 furui〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 古ければ furukereba | — | “if it is ~”. |
| Conditional (~たら) | 古かったら furukattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 古くなる furukunaru | 古くなります furukunarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 古すぎる furusugiru | 古すぎます furusugimasu | “too ~”. |
| Looks ~ (~そう) | 古そう furusou | 古そうです furusoudesu | “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.