Components
役に立つ is an exact match with one form of the following word:
役に立つ
BOOST
Reading : やくにたつ   
expression, 'tsu' godan verb
to be helpful; to be useful
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My current mastery of 役に立つ:
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Usefulness and usage:
Kanshudo usefulness level: 4 (among the 5,000 most useful words in Japanese)
• Kanshudo usefulness level is based on a usefulness score of 121,839 which gives a rank of 2,670
役に立つ is the most useful form. 2 additional forms are shown below.
This word is a member of our collection of the 10,000 most useful words in Japanese:
• This form is used about 60% of the time
• Google Japan frequency rank: 23,000 (about 27,300,000 results)
• This form appears in Wikipedia's list of JLPT N4 vocabulary (see JLPT collections)
• iknow! Core 6000 rank: 1439 (see iKnow! collections)
• Wikipedia most common 20000 words rank: 14495
• This form appears in the 1998 'Ichimango goi bunruishuu' frequent word list by Senmon Kyouiku
• This form appears in the 24,000 words in the Mainichi Shimbun frequency analysis by Alexandre Girardi
• This form is in band 23 in the EDICT word frequency file (bands go from 1-48, where 1 is most common - each contains about 500 words)
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Example sentences:
かれ
やく
たない
にんげん
人間
であること
かった

He has proven that he is not worth his salt.
かえ
こと
ものごと
物事
おぼ
える
やく

Repetition helps you remember something.
その
よぶん
余分
へや
部屋
きゃく
あった
とき
たいへん
大変
やく
こと
わかった
The extra room proved very useful when we had visitors.
やくに立つ
BOOST
Reading : やくにたつ   
My flashcards:
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Usefulness and usage:
• This form is rarely used
• Google Japan frequency rank: 152,000 (about 542,000 results)
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役にたつ
BOOST
Reading : やくにたつ   
My flashcards:
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Usefulness and usage:
• This form is used about 40% of the time
• Google Japan frequency rank: 30,000 (about 19,900,000 results)
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ヤク   エキ    office, role; service   
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step
lance shaft   
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キ    table   
また again   
リツ   リュウ   た to stand   たてる to build   
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