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Japanese verb有効 (yuukou) Conjugation
有効 (yuukou) means “valid, effective”. It is a な-adjective verb. It is a な-adjective: it takes な before a noun (有効な) and だ or です after it, so 有効だ, 有効でした, 有効に. Below is its conjugation in all 14 forms, plain and polite, the same forms the Japanese verb conjugation worksheets print in their answer keys.
- Meaning
- valid, effective
- Type
- な-adjective
- Dictionary form
- 有効
- Reading
- ゆうこう
- Romaji
- yuukou
- Negative
- 有効じゃない
- Past
- 有効だった
- Te-form
- 有効で
- Adverb
- 有効に
Basic forms
Present現在形・辞書形
| Plain | 有効だ |
|---|---|
| Plain negative | 有効じゃない / 有効ではない |
| Polite | 有効です |
| Polite negative | 有効じゃありません / 有効ではありません |
Past過去形・た形
| Plain | 有効だった |
|---|---|
| Plain negative | 有効じゃなかった / 有効ではなかった |
| Polite | 有効でした |
| Polite negative | 有効じゃありませんでした / 有効ではありませんでした |
Te-formて形
| Plain | 有効で |
|---|---|
| Plain negative | 有効じゃなくて / 有効ではなくて |
Can and if
Conditional (-ba)仮定形・ば
| Plain | 有効なら |
|---|---|
| Plain negative | 有効でなければ |
Conditional (-tara)たら
| Plain | 有効だったら |
|---|---|
| Plain negative | 有効じゃなかったら / 有効ではなかったら |
Adjectives
Adverb (adjectives)連用形
| Adverb | 有効に |
|---|
More common Japanese verbs and adjectives
- 普通 (futsuu)normal, ordinary, regular
- 豊か (yutaka)abundant, plentiful, rich
- 本当 (hontou)truth, reality, actuality
- 名誉 (meiyo)honor, honour, credit
- 明確 (meikaku)clear, precise, definite
- 問う (tou)to ask, to inquire
- 有力 (yuuryoku)influential, prominent, leading
- 選ぶ (erabu)to choose, to select, to pick
- 確か (tashika)sure, certain, positive
- 活発 (kappatsu)lively, active, vigorous
- 基本的 (kihonteki)fundamental, basic
- 急 (kyuu)sudden, abrupt, unexpected
About these tables
The forms are built from Wiktionary's conjugation tables, and they are the ones the Japanese verb conjugation worksheet generator prints, so a chart or answer key made there matches this page. That page explains how the forms were checked.
Print this verb chart opens 有効 (yuukou) on the worksheet preview with every form filled in, ready to print on A4 or US Letter or save as PDF. To practice it with other verbs and adjectives, the generator also makes blank conjugation boxes and quick quizzes with answer keys. To practice online instead, the Japanese verb conjugation quiz marks each form as you type it.
Verbs, adjectives and their meanings come from JMdict, the property of the Electronic Dictionary Research and Development Group, used in conformance with the Group's licence. The forms are built by the standard rules, with the irregular ones written out.