容易 (youi) conjugation
easy, simple, plain
容易 (ようい, youi) 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 | 容易だ youida | 容易です youidesu | The form you look up. Also the casual “is ~”. |
| Negative | 容易じゃない youijanai | 容易じゃないです youijanaidesu | “is not ~”. |
| Past | 容易だった youidatta | 容易でした youideshita | “was ~”. |
| Past negative | 容易じゃなかった youijanakatta | 容易じゃなかったです youijanakattadesu | “was not ~”. |
| Te-form | 容易で youide | — | Links to the next clause: “~ and …”. |
| Adverb | 容易に youini | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 容易な〜 youina〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 容易なら youinara | — | “if it is ~”. |
| Conditional (~たら) | 容易だったら youidattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 容易になる youininaru | 容易になります youininarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 容易すぎる youisugiru | 容易すぎます youisugimasu | “too ~”. |
| Looks ~ (~そう) | 容易そう youisou | 容易そうです youisoudesu | “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.