Grammar Info
N4 Lesson 8: 3/18

が必要(ひつよう)
Need, Necessary

Structure
Casual
Polite
Noun + + 必要 +
Verb + こと + + 必要 +
Noun + + 必要 + です
Verb + こと + + 必要 + です
Details
Register Standard
使用域 一般
Information
が必要(ひつよう) is a common expression in Japanese which is used to highlight the ‘need’ or ‘necessity’ of something. It is a structure that may only be used with nouns, which means that verbs will need to be nominalized (turned into noun-phrases) in order to use this construction.
  • プール泳(およ)ぐとき水着(みずぎ)が必要(ひつよう)
    When swimming in a pool, a swimsuit is necessary.
  • バス運転(うんてん)する特別(とくべつ)免許(めんきょ)が必要(ひつよう)
    You need a special license to drive a bus.
  • 彼(かれ)車(くるま)持(も)っていないから迎(むか)えに行(い)くことが必要(ひつよう)
    Because he doesn't have a car, it is necessary to go pick him up.
  • ここ泥棒(どろぼう)多(おお)いから出(で)かけ前(まえ)に鍵(かぎ)かけことが必要(ひつよう)
    Because there are a lot of burglars here, it is necessary to lock your door before you go out.
Both and may sometimes be omitted from this expression in casual speech. However, it is a good idea to at least use , to clarify the thing that is ‘necessary’.
  • 私(わたし)運転(うんてん)するとき眼鏡(めがね)が必要(ひつよう)
    I need glasses when I drive.
  • 田舎(いなか)住(す) 車(くるま)が必要(ひつよう)
    To live in the countryside, a car is necessary.
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テストする時(とき)えんぴつが必要(ひつよう)です
A pencil is necessary when you take a test.
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ケーキ作(つく)るなら砂糖(さとう)が必要(ひつよう)です
If you are going to make a cake, sugar is necessary.
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田舎(いなか)住(す)んだら車(くるま)が必要(ひつよう)です
If you live in the countryside, a car is necessary.
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