四角い (shikakui) conjugation
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四角い (しかくい, shikakui) 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 | 四角い shikakui | 四角いです shikakuidesu | The form you look up. Also the casual “is ~”. |
| Negative | 四角くない shikakukunai | 四角くないです shikakukunaidesu | “is not ~”. |
| Past | 四角かった shikakukatta | 四角かったです shikakukattadesu | “was ~”. |
| Past negative | 四角くなかった shikakukunakatta | 四角くなかったです shikakukunakattadesu | “was not ~”. |
| Te-form | 四角くて shikakukute | — | Links to the next clause: “~ and …”. |
| Adverb | 四角く shikakuku | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 四角い〜 shikakui〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 四角ければ shikakukereba | — | “if it is ~”. |
| Conditional (~たら) | 四角かったら shikakukattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 四角くなる shikakukunaru | 四角くなります shikakukunarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 四角すぎる shikakusugiru | 四角すぎます shikakusugimasu | “too ~”. |
| Looks ~ (~そう) | 四角そう shikakusou | 四角そうです shikakusoudesu | “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.