Grammar › N5 · 04 Adjectives and comparing
〜の (the one): the one (stands in for a noun)
N5 · 04 Adjectives and comparing
After an adjective, a noun or a clause, の stands in for a noun that is already known: "the one that …".
赤いの = the red one, 私の = mine, 昨日買ったの = the one I bought yesterday. Possessive の links two nouns (私の本); nominalizing の turns a clause into a noun (泳ぐのが好き). This one replaces the noun itself.
Examples
赤いのが欲しいです。
I want the red one.
これは私のです。
This is mine.
新しいのはありますか。
Do you have a new one?