Both
の and
こと turn verbs into nouns, but they feel different:
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こと is more conceptual and abstract. It treats the action as a general idea and sounds more detached. It's often used for information, ideas, or facts.
の feels more direct and personal. It points to the actual action as it happens. It sounds more immediate, and it's commonly used for things you directly see, hear, feel, or control.
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→ 私は死ぬことが怖い = "I'm afraid of death"
Here, the action is treated as a general concept.
→ 私は死ぬのが怖い = "I'm afraid of dying"
This feels more immediate and personal, as if you're afraid of dying rather than death as an abstract idea.
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The difference becomes clearer with direct perception. When you directly witness something, you usually use の.
→ 私は子どもが泣いているのを見た = "I saw a child crying"
What you saw wasn't the concept of a child crying—you saw the action itself.
The same contrast appears with hearing, especially when comparing direct perception and reported information.
→ 火山が噴火したことを聞いた = What you heard was the news of the volcano erupting.
Here, you received information about the event.
→ 火山が噴火したのを聞いた = You were there when the volcano erupted. You directly heard it.
In this case, you experienced the sound itself.
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Finally, when talking about actions you can directly control, の is usually preferred.
→ 酒を飲むのをやめた = "I quit drinking"
Here, the action feels concrete and personally managed rather than abstract.
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Quick rule of thumb:
Directly experienced / immediate / personal →
の
Abstract / conceptual / informational →
こと
Source: part of this video:
[www.youtube.com]