役に立つ・役にたつ|やくにたつyakunitatsu[1]atamadaka (head-high)

JLPT N4approx.Common
Which spelling to use
役に立つ役に立つ is the most common written form and the form beginners should use as their default in writing and study.
役にたつ役にたつ is a less common mixed kanji-and-kana spelling; 役に立つ is the safer choice for learners.
Definitions
  1. expression, godan verbto be helpful; to be useful
    それ以上いじょうはお役やくに立たてません。↗
    Beyond that I cannot help you.
Conjugation
Dictionary form役に立つ(やくにたつ)
Polite (masu)役に立ちます(やくにたちます)
Negative (nai)役に立たない(やくにたたない)
polite (masen)役に立ちません(やくにたちません)
classical zu / nu役に立たず・役に立たぬ(やくにたたず・やくにたたぬ)
Past (ta)役に立った(やくにたった)
polite (mashita)役に立ちました(やくにたちました)
Past negative (nakatta)役に立たなかった(やくにたたなかった)
polite (masen deshita)役に立ちませんでした(やくにたちませんでした)
Te form役に立って(やくにたって)
Potential役に立てる(やくにたてる)
Passive役に立たれる(やくにたたれる)
Causative役に立たせる(やくにたたせる)
Causative passive役に立たせられる・役に立たされる(やくにたたせられる・やくにたたされる)
Conditional (ba)役に立てば(やくにたてば)
tara役に立ったら(やくにたったら)
Volitional役に立とう(やくにたとう)
polite (mashou)役に立ちましょう(やくにたちましょう)
Imperative役に立て(やくにたて)

Common forms generated by rule; see the senses for honorific or irregular usage.

Transitive / intransitive pair
intransitive役に立つやくにたつ⇄transitive役に立てるやくにたてる
この道具どうぐが役やくに立たつ
この道具どうぐを役やくに立たてる
役に立つ describes something as being useful or serviceable on its own (intransitive), while 役に立てる focuses on the act of putting something to practical use (transitive).

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

Japanese definitions
  1. 助たすけになる。必要ひつようなときに効果こうかがある。
Kanji in this word

JLPT vocabulary levels are community estimates, not official (no official lists have been published since the 2010 revision).

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