多い (ooi) conjugation
many; there are a lot
多い (おおい, ooi) 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 | 多い ooi | 多いです ooidesu | The form you look up. Also the casual “is ~”. |
| Negative | 多くない ookunai | 多くないです ookunaidesu | “is not ~”. |
| Past | 多かった ookatta | 多かったです ookattadesu | “was ~”. |
| Past negative | 多くなかった ookunakatta | 多くなかったです ookunakattadesu | “was not ~”. |
| Te-form | 多くて ookute | — | Links to the next clause: “~ and …”. |
| Adverb | 多く ooku | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 多い〜 ooi〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 多ければ ookereba | — | “if it is ~”. |
| Conditional (~たら) | 多かったら ookattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 多くなる ookunaru | 多くなります ookunarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 多すぎる oosugiru | 多すぎます oosugimasu | “too ~”. |
| Looks ~ (~そう) | 多そう oosou | 多そうです oosoudesu | “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.