余計 (yokei) conjugation
too much, unnecessary, abundance, surplus, excess, superfluity
余計 (よけい, yokei) 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 | 余計だ yokeida | 余計です yokeidesu | The form you look up. Also the casual “is ~”. |
| Negative | 余計じゃない yokeijanai | 余計じゃないです yokeijanaidesu | “is not ~”. |
| Past | 余計だった yokeidatta | 余計でした yokeideshita | “was ~”. |
| Past negative | 余計じゃなかった yokeijanakatta | 余計じゃなかったです yokeijanakattadesu | “was not ~”. |
| Te-form | 余計で yokeide | — | Links to the next clause: “~ and …”. |
| Adverb | 余計に yokeini | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 余計な〜 yokeina〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 余計なら yokeinara | — | “if it is ~”. |
| Conditional (~たら) | 余計だったら yokeidattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 余計になる yokeininaru | 余計になります yokeininarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 余計すぎる yokeisugiru | 余計すぎます yokeisugimasu | “too ~”. |
| Looks ~ (~そう) | 余計そう yokeisou | 余計そうです yokeisoudesu | “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.