Understanding Nominalizers: の and こと
In Japanese, nominalizers are essential tools that turn verbs or entire verb phrases into nouns, allowing you to use them as subjects, objects, or topics in sentences. The two most common nominalizers are の and こと. While both serve similar functions, they are not always interchangeable. This guide will help you understand how and when to use each one correctly.
How to Form Noun Phrases with の and こと
To turn a verb into a noun phrase, simply attach の or こと to the plain (dictionary) form of the verb. This creates a clause that acts as a single noun.
泳ぐ → 泳ぐの / 泳ぐこと
oyogu → oyogu no / oyogu koto
本を読む → 本を読むの / 本を読むこと hon o yomu → hon o yomu no / hon o yomu koto to read a book → reading a book
When to Use の vs こと
Although both can nominalize verbs, their usage depends on context, verb Concrete Actions and Sensory Experiences
の is often used when referring to concrete, observable actions, especially with sensory verbs like 見る (to see), 聞く (to hear), or 感じる (to feel).
彼が走っているのを見た。
Kare ga hashitte iru no o mita.
I saw him running.
子供が歌うのを聞いた。
Kodomo ga utau no o kiita.
I heard the child singing.
Use こと for Abstract Concepts and General Activities
こと is preferred for abstract ideas, habits, abilities, or facts. It often appears with verbs like 好き (to like), できる (can do), or 始める (to start).
日本語を話すことが好きです。
Nihongo o hanasu koto ga suki desu.
I like speaking Japanese.
ピアノを弾くことができます。
Piano o hiku koto ga dekimasu.
I can play the piano.
Fixed Expressions with こと
Some common expressions always use こと and cannot be replaced with の.
ことがある (Have Experience Doing Something)
Used to express that you have (or have not) experienced something.
日本に行ったことがあります。
Nihon ni itta koto ga arimasu.
I have been to Japan.
ことにする (Decide To Do Something)
Indicates a personal decision or resolution.
毎日運動することにしました。
Mainichi undō suru koto ni shimashita.
I decided to exercise every day.
来月転勤することになりました。
Raigetsu tenkin suru koto ni narimashita.
It has been decided that I will transfer next month.
Common Mistakes and Tips
Don’t Confuse の as a Nominalizer with Other Uses
Remember that の can also be a possessive particle (e.g., 私の本 – my book) or a sentence-ending particle. Context is key!
Tip: Use こと with です for Definitions
When defining followed by です. For example:
私の趣味は写真を撮ることです。
Watashi no shumi wa shashin o toru koto desu.
My hobby is taking photos.
Avoid Using の with Certain Verbs Mastering の and こと is crucial for forming complex sentences in Japanese. Remember: With time and practice, choosing between の and こと will become intuitive. Keep listening to native speakers and pay attention to how they use these nominalizers!
Some verbs, like 伝える (to tell/inform) or 約束する (to promise), typically use こと and sound unnatural with の.
✅ 行くと伝えた (I said I would go)
❌ 行くのを伝えたPractice
Fill in the blank with の or こと:
Translate to Japanese using a nominalizer:
Summary
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