垂直 (suichoku) conjugation
vertical, perpendicular
垂直 (すいちょく, suichoku) 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 | 垂直だ suichokuda | 垂直です suichokudesu | The form you look up. Also the casual “is ~”. |
| Negative | 垂直じゃない suichokujanai | 垂直じゃないです suichokujanaidesu | “is not ~”. |
| Past | 垂直だった suichokudatta | 垂直でした suichokudeshita | “was ~”. |
| Past negative | 垂直じゃなかった suichokujanakatta | 垂直じゃなかったです suichokujanakattadesu | “was not ~”. |
| Te-form | 垂直で suichokude | — | Links to the next clause: “~ and …”. |
| Adverb | 垂直に suichokuni | — | Turns it into “~ly”, describing a verb. |
| Before a noun | 垂直な〜 suichokuna〜 | — | How it attaches when it modifies a noun. |
| Conditional (~ば/なら) | 垂直なら suichokunara | — | “if it is ~”. |
| Conditional (~たら) | 垂直だったら suichokudattara | — | “if / when it is ~”. The everyday conditional. |
| Become (~なる) | 垂直になる suichokuninaru | 垂直になります suichokuninarimasu | “becomes ~” — the change-of-state form. |
| Too much (~すぎる) | 垂直すぎる suichokusugiru | 垂直すぎます suichokusugimasu | “too ~”. |
| Looks ~ (~そう) | 垂直そう suichokusou | 垂直そうです suichokusoudesu | “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.