Grammar Info

N4 Lesson 8: 3/18

が必要(ひつよう)Need, Necessary

Structure

Noun + が + 必要(ひつよう) + だ
Verb + こと + が + 必要(ひつよう) + だ

Details

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About がひつよう

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.

  • プールで泳(およ)ぐときは水着(みずぎ)が必要(ひつよう)だ。

    When swimming in a pool, a swimsuit is necessary.

    • バスを運転(うんてん)するには特別(とくべつ)な免許(めんきょ)が必要(ひつよう)だ。

      You need a special license to drive a bus.

      • 彼(かれ)は車(くるま)を持(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)だ。

        Because he doesn't have a car, it is necessary to go pick him up.

        • ここは泥棒(どろぼう)が多(おお)いから出(で)かける前(まえ)に鍵(かぎ)をかけることが必要(ひつよう)だ。

          Because there are a lot of burglars here, it is necessary to lock your door before you go out.

          Both が and だ may sometimes be omitted from this expression in casual speech. However, it is a good idea to at least use が, to clarify the thing that is 'necessary'.

          • 私(わたし)は運転(うんてん)するときは眼鏡(めがね)が必要(ひつよう)。

            I need glasses when I drive.

            • 田舎(いなか)に住(す)むには車(くるま)が必要(ひつよう)。

              To live in the countryside, a car is necessary.

              Related

              Examples

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                テストをする時(とき)はえんぴつが必要(ひつよう)です。

                A pencil is necessary when you take a test.

                ケーキを作(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.

                田舎(いなか)に住(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.

                スノーボードに行(い)くなら、手袋(てぶくろ)が必要(ひつよう)です。

                If you are going snowboarding, you need gloves.

                何(なに)が必要(ひつよう)かな〜。

                I wonder what I need...

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