Grammar Info
N4 Lesson 5: 17/20

は~の一つ(ひとつ)だ
〜 is one of (many) 〜

Structure
Casual
Polite
Noun (A) + + (Category) Noun (B) + 一つ +
Noun (A) + + (Category) Noun (B) + 一つ + です
Details
Register Standard
使用域 一般
Information
In order to express that something is only one thing from within a larger category, the construction ~は~の一(ひと)つだ will be used. In this expression, (A), the thing that there is one of, will be followed by . After this, (B) + 一(ひと)つ will highlight the broader category to which (A) belongs.
  • アンドロイドスマートフォンOSの一(ひと)つ
    Android is one of (many) smartphone operating systems.
  • 電車(でんしゃ)乗(の)り物(もの)の一(ひと)つです
    Trains are one of (many) vehicles.
In this grammar point, の一(ひと)つ is a standard counter. This means that other counters can and will be used, when they are more appropriate than 一(ひと)つ.
  • 彼(かれ)家族(かぞく)の一人(ひとり)
    He is also one member of my family.
  • トマトフルーツの一種(いっしゅ)
    Tomatoes are one of many types of fruits.
  • このクレヨンこのセットの一本(いっぽん)
    This crayon is part of this set.
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ホンダ車(くるま)メーカーの一(ひと)つ
Honda is one of (many) car makers.
アイフォンスマートフォンの一(ひと)つ
iPhone is one of (many) smartphones.
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文法(ぶんぽう)大事(だいじ)勉強(べんきょう)の一(ひと)つです
Grammar is one of (many) important things to study.
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