静か (shizuka) conjugation
quiet, calm
静か (しずか, shizuka) is a na-adjective. Na-adjectives behave like nouns. The word itself never changes — you conjugate だ/です after it, and you need な to put it in front of a noun.
Conjugation table
| Form | Plain (casual) | Polite (~です) | When you use it |
|---|---|---|---|
| Dictionary / plain | 静かだ shizukada | 静かです shizukadesu | The form you look up. Also the casual “is ~”. |
| Negative | 静かじゃない shizukajanai | 静かじゃないです shizukajanaidesu | “is not ~”. |
| Past | 静かだった shizukadatta | 静かでした shizukadeshita | “was ~”. |
| Past negative | 静かじゃなかった shizukajanakatta | 静かじゃなかったです shizukajanakattadesu | “was not ~”. |
| Te-form | 静かで shizukade | — | Links to the next clause: “~ and …”. |
| Adverb | 静かに shizukani | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 静かな〜 shizukana〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 静かなら shizukanara | — | “if it is ~”. |
| Conditional (~たら) | 静かだったら shizukadattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 静かになる shizukaninaru | 静かになります shizukaninarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 静かすぎる shizukasugiru | 静かすぎます shizukasugimasu | “too ~”. |
| Looks ~ (~そう) | 静かそう shizukasou | 静かそうです shizukasoudesu | “looks / seems ~” from appearance. |
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Why it conjugates this way
Na-adjectives behave like nouns. The word itself never changes — you conjugate だ/です after it, and you need な to put it in front of a noun.
See the full rules in the adjective conjugation guide.