JLPT N5 Grammar: ~くなります / ~になります

Become ~ / Get ~ / Turn into ~ – Express natural changes

JLPT N5 文法 ~くなります / ~になります 解説

Master ~くなります / ~になります in 5 minutes. This guide shows you how to say "become ~" in Japanese, with real JLPT N5 examples and traps to avoid.

🚀 Quick JLPT N5 Warm-up Quiz

Q1: You want to say "The room became clean." Which is correct?
A. 部屋をきれいにしました
B. 部屋がきれいになりました

Answer: B (use が + になります for natural change; を + にします is "make it clean")

Quick Summary

Grammar Point
~くなります / ~になります
Meaning
Become ~ / Get ~
Usage
い-adj: drop い → くなります
な-adj & noun: add になります
Example

The room became clean.

📝 Quick Formula

い-adjective → remove い + くなります
な-adjective → + になります
noun → + になります
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💡 Switch to Hiragana only or Rōmaji if you're just starting out.

What does ~くなります / ~になります mean?

These patterns express a natural change or a result — something becomes a certain state, often without a direct person doing the action.

  • ~くなります → used with い-adjectives (drop い, add くなります).
    例:あかるい → あかくなります れい:あかるい → あかるくなります rei: akarui → akaruku narimasu (becomes bright)
  • ~になります → used with な-adjectives and nouns (add になります directly).
    例:きれい → きれいになります / よるよるになります れい:きれい → きれいになります / よる → よるになります rei: kirei → kirei ni narimasu / yoru → yoru ni narimasu

This grammar is the intransitive counterpart of ~くします / ~にします. Learn the difference to master both JLPT N5 patterns.

How to Pronounce

~くなります: ku na ri masu

~になります: ni na ri masu

Examples & Mini Dialogue


The room became clean. (な-adj: きれい)

Notice the particle が marks the subject that undergoes change. No person is doing the cleaning — it just became clean.


The sound became loud. (い-adj: 大きい)

The い-adjective 大きい drops い → 大きくなります.


It became night. (noun: 夜)

Nouns take になります to express a change in state or time.


It became quiet. (な-adj: 静か)

Often used to describe a change in atmosphere or condition.


The room became bright. (い-adj: 明るい)

Again, が marks the subject. Nobody turned on the light — we just describe the result.

🗣️ Mini Dialogue
A:
B:
("How's the weather?" — "It got warm.")

When to Use in Real Japan

  • Describing weather changes: あつくなりました / さむくなりましたあつくなりました / さむくなりましたAtsuku narimashita / samuku narimashita
  • Talking about personal growth: 日本語にほんご上手じょうずになりました。にほんごがじょうずになりました。Nihongo ga jōzu ni narimashita.
  • Time progression: はるになりました。はるになりました。Haru ni narimashita. (Spring came / It became spring)
  • Health & condition: 元気げんきになりました。げんきになりました。Genki ni narimashita. (I got well / became energetic)

⚡ ~になります (become) vs ~にします (make) — Don't Confuse Them

These two patterns are tested together on the JLPT N5. The difference is who causes the change.

Pattern Meaning Example
になります Became (natural change, no direct actor) 部屋がきれいになりました。
The room became clean. (just happened)
にします Made it (someone did it on purpose) 部屋をきれいにしました。
(I) made the room clean.

💡 Exam tip: If you see が → probably ~なります. If you see を → probably ~します. But always check the meaning!

→ Need the "make it" version? See full lesson on ~くします / ~にします.

Common Mistakes

部屋へやをきれいになりましたへやをきれいになりましたHeya o kirei ni narimashita
部屋へやがきれいになりましたへやがきれいになりましたHeya ga kirei ni narimashita
(~なります uses が, not を, for the thing that changes)

🔍 Why? Learners often mix up ~します (transitive) and ~なります (intransitive) particles. Remember: が + なります, を + します.

おおきいになりますおおきいになりますŌkii ni narimasu
おおきくなりますおおきくなりますŌkiku narimasu
(大きい is い-adj → 大きく + なります)

🔍 Same rule as ~くします: い-adjectives must drop い before adding くなります.

🎌 JLPT N5 Exam Trick

The test often shows two sentences and asks you to pick the correct particle:

  • 「部屋 ( ) きれいになりました」 → choose が (not を)
  • 「部屋 ( ) きれいにしました」 → choose を

Look at the verb ending: なります = が, します = を. This rule alone saves you points on multiple questions.

JLPT N5 Practice Questions

1. "The room became dark." (くらくらいkurai = dark, い-adj)
A. 部屋が暗いになりました。
B. 部屋が暗くなりました。

Show AnswerCorrect: B (暗い → 暗く + なります)

2. "I became well." (元気 = well, な-adj)
A. 元気になりました。
B. 元気くしました。

Show AnswerCorrect: A (な-adj + になります)

3. Choose the natural sentence.
A. 音が大きくなりました。
B. 音を大きくしました。

Show AnswerBoth are grammatically correct, but A is "the sound became loud" (natural change); B is "someone turned up the volume". JLPT may ask you to choose based on context.
⚠️ Mixing up にします and になります is one of the top N5 mistakes.

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About the Instructor

This lesson is taught by Anup Sensei, an experienced Japanese language instructor at Gogaku Language & Training Center in Pokhara. He has studied and worked in Japan and specializes in practical JLPT preparation and real-life communication skills.

Frequently Asked Questions

What does ~くなります / ~になります mean?

It means "become ~" or "get ~" — used to describe a natural change of state, like weather, time, or conditions.

What is the difference between ~になります and ~にします?

~になります is "become" (natural result), while ~にします is "make it / decide" (intentional action). The particles also differ: が + なります, を + します.

How do I use ~くなります with い-adjectives?

Remove the final い and add くなります. Examples: 暑い → 暑くなります, 大きい → 大きくなります.

Is きれい used with くなります or になります?

きれい is a な-adjective, so it takes になります: きれいになります (not きれくなります).

Can I use ~になります for people?

Yes, for example 先生になります (become a teacher). But for adjectives about people (like 上手), use に: 日本語が上手になりました (I became good at Japanese).

Continue Learning

Now review the transitive counterpart:
~くします / ~にします (make it ~)

Learn ~くします / ~にします →

→ Explore the full JLPT N5 Grammar Hub

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