The expressions ～になる and ～くなる mean "to become" and are used to describe a change of state. Which form you use depends on the type of word that precedes .
With na-adjectives: ～になる
Drop and add .
。
My Japanese has gotten better.
With i-adjectives: ～くなる
Drop the final い and add .
。
The days have gotten shorter.
。
It's gotten cold recently, hasn't it?
With nouns: ～になる
Add directly after the noun. This expresses that something or someone has become or turned into something.
、。
I will turn twenty next year.
To express "to become not ~" (i.e. something ceases to be), use the negative stem + :
- i-adjectives: drop い, add
- na-adjectives / nouns: add or
- verbs: form + (e.g. – to stop eating)
。
I stopped liking sweets.
。
I've stopped eating much recently.
Key point
describes a **natural or spontaneous change**, unlike
which implies someone deliberately causes the change. Compare:
。
The room got warm. (naturally)
。
I made the room warm. (deliberately)
Lingaku