真ん円い (manmarui) conjugation
perfectly round
真ん円い (まんまるい, manmarui) 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 | 真ん円い manmarui | 真ん円いです manmaruidesu | The form you look up. Also the casual “is ~”. |
| Negative | 真ん円くない manmarukunai | 真ん円くないです manmarukunaidesu | “is not ~”. |
| Past | 真ん円かった manmarukatta | 真ん円かったです manmarukattadesu | “was ~”. |
| Past negative | 真ん円くなかった manmarukunakatta | 真ん円くなかったです manmarukunakattadesu | “was not ~”. |
| Te-form | 真ん円くて manmarukute | — | Links to the next clause: “~ and …”. |
| Adverb | 真ん円く manmaruku | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 真ん円い〜 manmarui〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 真ん円ければ manmarukereba | — | “if it is ~”. |
| Conditional (~たら) | 真ん円かったら manmarukattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 真ん円くなる manmarukunaru | 真ん円くなります manmarukunarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 真ん円すぎる manmarusugiru | 真ん円すぎます manmarusugimasu | “too ~”. |
| Looks ~ (~そう) | 真ん円そう manmarusou | 真ん円そうです manmarusoudesu | “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.