こと — Nominalizer (turning verbs into nouns)
こと nominalizes verbs and clauses, turning them into noun phrases so a verb/clause can act as subject, object, or topic. Compare with の, which feels more immediate and emotional.
Structure
[Verb dictionary / plain form] + こと
Examples
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.
話すこと = the act of speaking (nominalized) → subject
毎日運動することが大切です。
Mainichi undou suru koto ga taisetsu desu.
It is important to exercise every day.
運動すること = exercising (nominalized) → subject
彼が来ないことは知っていた。
Kare ga konai koto wa shitte ita.
I knew that he wasn't coming.
来ないこと = the fact of not coming (clause as noun)
• こと vs の nominalizer: こと is more formal/written/abstract; の is more spoken/emotional/concrete. • Fixed expressions: ことがある (have experience / sometimes), ことができる (can do), ことにする (decide to), ことになる (be decided). • Learn these set expressions as whole units.
Commonly confused with
The JLPT rarely asks whether you recognise a pattern — it asks which of several similar patterns fits. These are the ones こと is tested against.
vs の (nominalizer)
の is preferred with verbs of perception/emotion and in casual speech (見るのが好き); こと is preferred for abstract, formal, or reported statements (話すことは難しい).
vs の (only-の cases)
After perception verbs (見える, 聞こえる) and in constructions like 〜のを待つ, only の works — こと is ungrammatical there.
More grammar patterns
- ことがある — Have experienced / Sometimes happens
- ことになる — It has been decided / It turns out
- ことにする — Decide to / Make it a rule to
- 〜方 (かた) — Way / Method of doing (how-to)
- 〜たり〜たり — Do things like… and… (representative actions)
- ということ — The Fact That / Meaning That
- ところ — About To / In the Middle / Just Finished (Timing)
- と思う — I think / I believe
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