盛ん (sakan) conjugation
prosperous, active, thriving
盛ん (さかん, sakan) 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 | 盛んだ sakanda | 盛んです sakandesu | The form you look up. Also the casual “is ~”. |
| Negative | 盛んじゃない sakanjanai | 盛んじゃないです sakanjanaidesu | “is not ~”. |
| Past | 盛んだった sakandatta | 盛んでした sakandeshita | “was ~”. |
| Past negative | 盛んじゃなかった sakanjanakatta | 盛んじゃなかったです sakanjanakattadesu | “was not ~”. |
| Te-form | 盛んで sakande | — | Links to the next clause: “~ and …”. |
| Adverb | 盛んに sakanni | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 盛んな〜 sakanna〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 盛んなら sakannara | — | “if it is ~”. |
| Conditional (~たら) | 盛んだったら sakandattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 盛んになる sakanninaru | 盛んになります sakanninarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 盛んすぎる sakansugiru | 盛んすぎます sakansugimasu | “too ~”. |
| Looks ~ (~そう) | 盛んそう sakansou | 盛んそうです sakansoudesu | “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.