Grammar Info
N4 Lesson 8: 5/18

必要(ひつよう)がある
it is necessary to

Structure
Casual
Formal
Verb + 必要 + が + ある
Verb + 必要 + が + あります
Details
Register Standard
使用域 一般
Information
Like が必要(きつよう), 必要(ひつよう)がある is an expression which is used to highlight the ‘need’ or ‘necessity’ of something. The primary difference being that 必要(ひつよう)がある highlights the need to ‘do (A)’, and will therefore be used with verbs (without the need for nominalization).
To use 必要(ひつよう)がある, just attach it after the plain form of the verb that you want to highlight the ‘need’ for.
  • 明日(あした)にテストがあるから、勉強(べんきょう)する必要(ひつよう)がある
    Because I have a test tomorrow, it is necessary to study.
  • 息子(むすこ)まだ小(ちい)さので、いつも一緒(いっしょ)にい必要(ひつよう)がある
    Since my son is still little, it is necessary for me to be with him at all times.
As we can see, this construction is simply the combination of a verb + 必要(ひつよう) (creating a verb modified noun), the 格助詞(かくじょし) (case-marking particle) , and the う-Verbある. In this way, it just means ‘the need of doing (A) exists’.
Naturally, this grammar pattern may also be used negatively, to highlight that there is ‘no need to do (A)’, or that ‘doing (A) is not necessary’.
  • カイル日本語(にほんご)分(わ)かので、書類(しょるい)英語(えいご)に訳(やく)必要(ひつよう)がない
    Since Kyle understands Japanese, there is no need to translate the documents into English.
  • 娘(むすめ)元気(げんき)になっので、病院(びょういん)に行(い)く必要(ひつよう)がありません
    Since my daughter got well, there is no need to go to the hospital.
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朝(あさ)ご飯(はん)食(た)べる必要(ひつよう)がある
It is necessary to eat breakfast.
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海外(かいがい)旅行(りょこう)行(い)きたいなら、パスポート持(も)っていく必要(ひつよう)がある
It is necessary to take a passport with you if you want to go overseas.
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それ明日(あした)までに終(お)える必要(ひつよう)がある
It is necessary to finish that by tomorrow.
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Books
Tobira
Page 47