役に立つ（やくにたつ）Conjugation
JLPT N4 · Godan verb (Group 1) · Meaning: to be useful
Full conjugation table
| Form | Japanese | Reading |
|---|---|---|
| Dictionary form The base form — casual speech and the stem for many grammar patterns. | 役に立つ | やくにたつ |
| masu (polite present) Polite present/future affirmative. | 役に立ちます | やくにたちます |
| masen (polite negative) Polite present negative. | 役に立ちません | やくにたちません |
| mashita (polite past) Polite past affirmative. | 役に立ちました | やくにたちました |
| masen deshita (polite past neg.) Polite past negative. | 役に立ちませんでした | やくにたちませんでした |
| te-form The most versatile form — linking, requests, progressive and more. | 役に立って | やくにたって |
| ta (plain past) Plain past affirmative. | 役に立った | やくにたった |
| nai (plain negative) Plain present negative. | 役に立たない | やくにたたない |
| nakatta (plain past neg.) Plain past negative. | 役に立たなかった | やくにたたなかった |
| Potential Ability or possibility — 'can do'. | 役に立てる | やくにたてる |
| Passive Passive voice — 'to be done to'. | 役に立たれる | やくにたたれる |
| Causative Causative — 'to make/let someone do'. | 役に立たせる | やくにたたせる |
| Volitional Volitional — 'let's…' or intention. | 役に立とう | やくにたとう |
| Imperative Imperative — a strong command; used sparingly. | 役に立て | やくにたて |
| Prohibitive Prohibitive — 'don't do it!'. | 役に立つな | やくにたつな |
| Conditional (ba) Hypothetical 'if' — leans written. | 役に立てば | やくにたてば |
| Conditional (tara) The most versatile everyday 'if / when'. | 役に立ったら | やくにたったら |
Example sentences
- この辞書は勉強にとても役に立つ。 — This dictionary is very useful for studying.
- 旅行で覚えた言葉が役に立った。 — The words I learned on the trip came in handy.