単一 (tanitsu) conjugation
single, simple, sole
単一 (たんいつ, tanitsu) 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 | 単一だ tanitsuda | 単一です tanitsudesu | The form you look up. Also the casual “is ~”. |
| Negative | 単一じゃない tanitsujanai | 単一じゃないです tanitsujanaidesu | “is not ~”. |
| Past | 単一だった tanitsudatta | 単一でした tanitsudeshita | “was ~”. |
| Past negative | 単一じゃなかった tanitsujanakatta | 単一じゃなかったです tanitsujanakattadesu | “was not ~”. |
| Te-form | 単一で tanitsude | — | Links to the next clause: “~ and …”. |
| Adverb | 単一に tanitsuni | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 単一な〜 tanitsuna〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 単一なら tanitsunara | — | “if it is ~”. |
| Conditional (~たら) | 単一だったら tanitsudattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 単一になる tanitsuninaru | 単一になります tanitsuninarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 単一すぎる tanitsusugiru | 単一すぎます tanitsusugimasu | “too ~”. |
| Looks ~ (~そう) | 単一そう tanitsusou | 単一そうです tanitsusoudesu | “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.