こと vs の: Japanese Verb Nominalizers Explained (Complete Guide)
Master the difference between こと and の as verb nominalizers in Japanese. Learn when each turns verbs into nouns with examples and practice exercises for JLPT N4.
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Reviewed by GyanMirai Editorial Team•Last reviewed 2025-01-28
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Grammar Comparison JLPT N4 JLPT N4
ことvsの
こと vs の: Japanese Verb Nominalizers Explained (Complete Guide)
Master the difference between こと and の as verb nominalizers in Japanese. Learn when each turns verbs into nouns with clear examples, common mistakes, and practice exercises for JLPT N4.
Read time: 10 min readSearches: 6,800+ monthlyUpdated: February 3, 2026
Understanding the difference between こと (koto) andの (no) is one of the most important distinctions in Japanese grammar. This comprehensive guide will help you master when and how to use each one correctly.
Grammar Point A
こと (koto)
Verb nominalizer (abstract/general)
Turns verbs into noun phrases for abstract concepts, general facts, experiences, and formal expressions. Used when talking about activities in a general or conceptual sense. Required in certain fixed grammar patterns.
Turns verbs into noun phrases for concrete, immediate, or sensory situations. Used when the speaker directly perceives or experiences an action — things you can see, hear, or feel happening. More casual and conversational than こと.
Formation: Verb (plain form) + の
Quick Comparison Table
Aspect
こと
の
Meaning
Verb nominalizer (abstract/general)
Verb nominalizer (concrete/sensory)
Usage
Turns verbs into noun phrases for abstract concepts, general facts, experiences, and formal expressions. Used when talking about activities in a general or conceptual sense. Required in certain fixed grammar patterns.
Turns verbs into noun phrases for concrete, immediate, or sensory situations. Used when the speaker directly perceives or experiences an action — things you can see, hear, or feel happening. More casual and conversational than こと.
Formation
Verb (plain form) + こと / Verb (past) + こと
Verb (plain form) + の
JLPT Level
N4
N4
Nature of action
Abstract, conceptual, general
Concrete, immediate, sensory
With perception verbs (見る, 聞く)
❌ Unnatural
✅ Required
Fixed patterns (ことがある, etc.)
✅ Required
❌ Cannot substitute
With 好き/嫌い/上手/下手
✅ Works (slightly formal)
✅ Works (more casual)
Formality
More formal / written
More casual / spoken
Emotional closeness
Objective, detached
Personal, immediate
General truths/facts
✅ Preferred
⚠️ Works but less natural
Real-time events
⚠️ Possible but detached
✅ Natural and immediate
Key Differences
1
Abstract vs Concrete: こと is for abstract concepts and general ideas: '日本語を勉強することが大切です' (Studying Japanese is important — abstract concept). の is for concrete, observable situations: '彼が走っているのを見た' (I saw him running — directly perceived). If you can physically see/hear/feel it, use の.
2
Perception Verbs (見る, 聞く, 感じる): With perception verbs (see, hear, feel), の is required: '鳥が歌っているのを聞いた' (I heard birds singing). Using こと here would sound unnatural because you're describing something you directly experienced through your senses.
3
Fixed Grammar Patterns: Several grammar patterns require こと specifically: ことがある (experience), ことができる (ability), ことにする (decide to), ことになる (it's been decided). You cannot substitute の in these patterns.
4
Emotional / Personal Situations: の feels more personal, emotional, and immediate. '遅れたのはすみません' sounds more heartfelt than '遅れたことはすみません.' In casual speech, の is more common because it feels warmer and less formal.
5
Interchangeability: In many cases, both work: '料理を作ること/のが好きです' (I like cooking). When interchangeable, こと sounds slightly more formal/written and の sounds more casual/spoken. But in fixed patterns and with perception verbs, they are NOT interchangeable.
When to Use Which?
Follow this decision guide to choose the right grammar point.
Yes
Yes
Use こと
No
Use の
No
Yes
Use の
No
Use こと
Examples with Explanations
こと
日本語を話すことは難しいです。
Nihongo wo hanasu koto wa muzukashii desu.
Speaking Japanese is difficult.
Tip: こと makes 'speaking Japanese' into an abstract noun — we're talking about the concept of speaking Japanese in general, not a specific instance.
Context: Making a general statement about an abstract concept
の
彼女が泣いているのを見ました。
Kanojo ga naite iru no wo mimashita.
I saw her crying.
Tip: の is required here because the speaker directly perceived the action through their eyes. With perception verbs (見る, 聞く), の is the natural choice. こと would sound unnatural.
Context: Describing something you directly saw or witnessed
こと
日本に行ったことがあります。
Nihon ni itta koto ga arimasu.
I have been to Japan before.
Tip: ことがある is a fixed grammar pattern meaning 'have the experience of.' You CANNOT use の here — のがある would be grammatically incorrect in this context.
Context: Talking about past experiences — fixed pattern
の
隣の部屋で誰かが歌っているのが聞こえます。
Tonari no heya de dareka ga utatte iru no ga kikoemasu.
I can hear someone singing in the next room.
Tip: の is used because you're directly perceiving the sound — you can hear it right now. 聞こえる (can hear) is a perception verb that requires の.
Context: Describing something you can currently hear
こと
毎日運動することが大切です。
Mainichi undou suru koto ga taisetsu desu.
Exercising every day is important.
Tip: こと turns the verb phrase into an abstract noun — the concept of daily exercise. This is a general truth, not a specific situation. Both こと and の work here, but こと is more natural for general/formal statements.
Context: Giving advice about a general concept
の
電車が来るのが遅い。
Densha ga kuru no ga osoi.
The train is slow to come. / The train coming is late.
Tip: の is natural here because the speaker is experiencing the delay in real-time — they're waiting and can feel the train hasn't arrived. It's an immediate, concrete experience.
Context: Complaining about something you're experiencing now
こと
読書をすることにしました。
Dokusho wo suru koto ni shimashita.
I decided to read. / I've decided on reading.
Tip: ことにする (decide to do) is a fixed grammar pattern. Only こと works here — の cannot be substituted in this expression.
Context: Announcing a decision — fixed pattern
の
子供が遊んでいるのを見るのが好きです。
Kodomo ga asonde iru no wo miru no ga suki desu.
I like watching children play.
Tip: Two uses of の in one sentence! First の: what I see (children playing — perception). Second の: the activity I like (watching — nominalizer). Both are natural because they involve direct perception.
Context: Expressing a preference about something you physically observe
こと
約束を守ることは大事です。
Yakusoku wo mamoru koto wa daiji desu.
Keeping promises is important.
Tip: こと nominalizes an abstract moral concept. We're talking about promise-keeping as a general principle, not a specific instance. こと is more natural than の for such formal/abstract statements.
Context: Stating a moral or ethical principle
の
雨が降り始めたのに気づきませんでした。
Ame ga furihajimeta no ni kizukimasen deshita.
I didn't notice that it had started raining.
Tip: の is used because rain starting is a concrete, physical event that could be perceived. 気づく (notice) relates to sensing something, so の fits naturally.
Context: Describing a concrete event you failed to perceive
Common Mistakes to Avoid
Mistake #1Using こと with perception verbs
Correction: Use の with 見る, 聞く, 聞こえる, 感じる when directly perceiving an action
Perception verbs describe direct sensory experience — you see, hear, or feel something happening. This requires の because it's concrete and immediate. こと would make it sound like you saw the abstract concept, not the actual event.
Wrong: 彼が走っていることを見た。 -- I saw the fact that he was running (unnatural)
Correct: 彼が走っているのを見た。 -- I saw him running (natural, direct perception)
These are fixed grammar patterns that only accept こと. They express abstract concepts (experience, ability, decision) that require the conceptual nominalizer.
Wrong: 富士山に登ったのがあります。 -- I have climbed Mt. Fuji before (wrong pattern)
Correct: 富士山に登ったことがあります。 -- I have climbed Mt. Fuji before (correct pattern)
Mistake #3Always defaulting to こと in casual speech
Correction: Use の more in casual conversation — it sounds more natural
In everyday spoken Japanese, の is used much more frequently than こと. Over-using こと in casual conversation sounds stiff and textbook-like. When in doubt and it's casual, try の first.
Wrong: 料理を作ることが好き。(in casual speech — too stiff) -- I like cooking (overly formal for casual chat)
Correct: 料理を作るのが好き。 -- I like cooking (natural and casual)
Mistake #4Confusing の (nominalizer) with の (possessive)
Correction: Context determines meaning — after verbs it's a nominalizer, between nouns it's possessive
食べるの = eating (nominalizer, after verb). 私の本 = my book (possessive, between nouns). The の particle has multiple functions, but after a verb in plain form, it acts as a nominalizer.
Wrong: Thinking 食べるの means 'eating's' (possessive) -- の after a verb = nominalizer, not possessive
Correct: 食べるの = 'eating' (the act of eating, nominalized) -- Context: 食べるのが好き = I like eating
Memory Tips
Tip 1
こと = Concept, の = Now
こと is for concepts and ideas (things you think about). の is for things happening now (things you see, hear, feel). If you can point at it or hear it happening, use の. If it's a general idea or principle, use こと.
Example: Can you see/hear it right now? → の. Is it an abstract idea? → こと.
Tip 2
Perception = の (Always)
Anytime you use 見る (see), 聞く (hear), 聞こえる (be audible), 感じる (feel), or 気づく (notice) with a nominalized verb, it's ALWAYS の. No exceptions. These verbs need direct, sensory input.
Example: 見た/聞いた/感じた + の → always. ことを見た → never.
Tip 3
Fixed Patterns = こと (Memorize These)
Just memorize the fixed patterns: ことがある (experience), ことができる (can do), ことにする (decide to), ことになる (it's been decided), ことはない (no need to). These ALWAYS use こと. Everything else? Usually interchangeable with nuance differences.
Example: Think 'KOTO patterns' = がある/ができる/にする/になる
Practice Exercises
Test your understanding with these practice questions. Click on your answer to see if you are correct.
0 / 8 answered
Q1
日本に行った＿＿がありますか？
Have you been to Japan before?
Q2
彼が歌っている＿＿を聞きました。
I heard him singing.
Q3
音楽を聴く＿＿が好きです。
I like listening to music.
Q4
毎日勉強する＿＿は大変です。
Studying every day is tough.
Q5
赤ちゃんが泣いている＿＿が聞こえますか？
Can you hear the baby crying?
Q6
来年、留学する＿＿にしました。
I've decided to study abroad next year.
Q7
猫がテーブルから落ちた＿＿を見ました。
I saw the cat fall from the table.
Q8
嘘をつく＿＿はよくないです。
Lying is wrong.
Frequently Asked Questions
In casual spoken Japanese, の is used much more frequently. Native speakers naturally default to の in conversation because it feels warmer and more personal. Reserve こと for formal situations, writing, and fixed grammar patterns. If you're speaking casually and it's not a fixed pattern, の is almost always fine.
The main fixed patterns are: ことがある (have experience of), ことができる (can do), ことにする (decide to do), ことになる (it has been decided), ことはない (there's no need to), ことだ (should/must — advice). These appear frequently on JLPT N4 and N3. Memorize them — they always use こと, never の.
There's one exception: when you're talking about learning ABOUT something (not directly perceiving it). '彼が結婚したことを聞いた' (I heard THAT he got married) is okay because you learned a fact, not directly perceived it. But '彼が歌っているのを聞いた' (I heard him singing) uses の because you directly heard the sound. The key: did your ears actually hear the sound/action? → の. Did you learn information? → こと.
のこと after a noun means 'about' or 'regarding' — it's a different usage. '日本のことが好きです' (I like things about Japan / I like Japan). This is different from the nominalizer の. Think of のこと as 'the matter/things concerning X.' It adds warmth: '彼のことが好き' (I like him — warm/romantic) vs '彼が好き' (I like him — neutral).
Yes, but that's a DIFFERENT の — the explanatory の (sometimes written as んです/のです). '何を食べたの？' (What did you eat?) is the explanatory/questioning の, not the nominalizer. The nominalizer の turns verbs into nouns mid-sentence; the sentence-final の asks for explanation or adds emotional nuance.
Summary
Use こと when...
Turns verbs into noun phrases for abstract concepts, general facts, experiences, and formal expressions. Used when talking about activities in a general or conceptual sense. Required in certain fixed grammar patterns.
Use の when...
Turns verbs into noun phrases for concrete, immediate, or sensory situations. Used when the speaker directly perceives or experiences an action — things you can see, hear, or feel happening. More casual and conversational than こと.
Pro Tip: The best way to master the difference is through reading and listening practice. Pay attention to how native speakers use these grammar points in context.