Grammar Info
N5 Lesson 8: 9/13

になる・くなる
To become (adjective)

Structure
Casual
Formal
[な]Adjective + + なる
[い]Adjective[く]+ なる

Exceptions:
いいよくなる
[な]Adjective + + なります
[い]Adjective[く]+ なります

Exceptions:
いいよくなります
Details
Part of Speech Expression
Word Type Verb
Register Standard
品詞 表現
単語の種類 動詞
使用域 一般
Information
になる (with な-Adjectives), or くなる (with い-Adjectives) is an expression used in Japanese to show that something is ‘becoming (A)’. It can be used with any form of なる, to highlight that something will become (non-past), is becoming (continuous), or has become (past). It can even be used with negative forms, to show that something ‘will not become (A)’.
  • 早(はや)食(た)べ、冷(つめ)たくなる
    Hurry up and eat, it will get cold.
  • お茶(ちゃ)冷(つめ)たくなっている
    The tea got cold.
  • コーヒー温(ぬる)くなった
    The coffee has become lukewarm.
  • 私(わたし)医者(いしゃ)にならない
    I won’t become a doctor.
The adjective いい ‘good’ is an exception to the regular conjugation rules for い-Adjectives, and will conjugate as よくなる, not いくなる.
  • 勉強(べんきょう)ているから、頭(あたま)良(よ)くなる
    Because I study, I will become smart. (Literally, ‘my head will get good’)
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難(むずか)しくなる
To become difficult.
Play  
嬉(うれ)しくなる
To become happy.
Play  
早(はや)くなる
To become fast.
Play  
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Tae Kim
JapaneseTest4You
Books
Genki I
Page 196
Genki I 2nd Edition
Page 234
みんなの日本語 I
Page 122 [CH 19]
Marugoto Elementary 2 (A2) Rikai
Page 149
Tae Kim's Japanese Grammar Guide
Page 129 & 130