Grammar Info
N5 Lesson 8: 9/13

になる・くなる
To become (adjective)

Structure
Casual
Polite
[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’)
Slow Male
Hide All
Hide Japanese
Hide English
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  
Online
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