Translation guide
A nominalizing suffix turns a verb, adjective, or clause into a noun phrase so it can be used as a subject, object, or topic in Japanese. The most common and versatile nominalizer is の, followed by こと for abstract or general concepts. Choosing between them depends on the main verb, level of formality, and whether the meaning is concrete/experiential or abstract/general.
I like watching movies.
Use の for personal preferences.
The learner wants to use a verb or adjective as a noun phrase, e.g., 'I like reading', 'It is difficult to understand', 'I forgot to call'.
Attach の to the plain form of a verb or adjective to create a noun phrase. Used widely in casual and spoken Japanese. Often preferred for concrete, personal, or sensory experiences, and with verbs like 見る, 聞く, 待つ, 手伝う, 止める, etc.
I like watching movies.
I'm waiting for him to come.
Cooking is fun.
Attach こと to the plain form to create a noun phrase. Often used for abstract, general, or conceptual matters, and in fixed expressions like ことができる (can do), ことがある (have done), ことにする (decide to), ことになる (it is decided that). More common in formal/written contexts.
In casual speech, の often contracts to ん, especially in explanatory or question patterns (〜んです, 〜んだ). This is a natural spoken form.
The learner needs to express ability, experience, decision, or obligation using set patterns.
Standard pattern for 'can do'. Verb plain form + ことができる. More formal than potential form verbs.
The learner wants to know when to use の vs. こと, especially when both seem possible.
When the main verb involves direct perception (見る, 聞く, 感じる), waiting (待つ), helping (手伝う), stopping (止める), or is a concrete action, の is strongly preferred. こと would sound unnatural or overly formal.
The learner wants to turn an adjective into a noun, e.g., 'the beauty', 'being kind'.
Attach の to the plain form of an い-adjective, or なの to a な-adjective, to create a noun phrase meaning 'the ~ one' or 'being ~'. Often used to refer to a specific instance or thing.
の tends to be used for concrete, immediate, or personal experiences, while こと is used for abstract, general, or conceptual matters. With perception verbs (見る, 聞く, 感じる) and verbs like 待つ, 手伝う, 止める, only の is natural. In fixed grammar patterns (ことができる, ことがある, ことにする, ことになる), only こと is used. In many other cases, both are possible with a slight difference in formality or nuance.
I can speak Japanese.
I have lived abroad.
Exercising every day is important.
What are you doing?
I'm going (explanatory).
I can read kanji.
Pattern for 'have done (before)' or 'there are times when'. Verb plain past + ことがある for experience; plain non-past + ことがある for occasional occurrence.
I have climbed Mt. Fuji.
Sometimes I skip breakfast.
Pattern for 'decide to do'. Verb plain form + ことにする. Indicates a personal decision.
I decided to jog every day.
Pattern for 'it is decided/arranged that'. Verb plain form + ことになる. Implies the decision was made by others or circumstances.
It has been decided that I will transfer to Osaka next month.
I can hear birds singing.
I saw him running.
When the statement is about a general truth, a concept, or involves verbs like 考える (think), 信じる (believe), 理解する (understand), こと is more natural. の can be used but may sound more personal or colloquial.
Humans know that they will die.
I believe that he is innocent. (こと can be omitted after と)
With adjectives like 好き, 嫌い, 上手, 下手, both の and こと can be used. の is more common in casual speech; こと is slightly more formal/written.
I want the big one.
I like quiet ones / quiet places.
Use こと to nominalize an adjective when referring to the abstract quality or state. For な-adjectives, であること is more formal; なこと is also used in casual speech.
Being healthy is the most important thing.
Being honest is important.
I'm waiting for him to come.
I'm waiting for him to come. (incorrect usage)
In informal conversation, overusing こと can sound stiff or bookish. When in doubt, の is safer for everyday spoken Japanese, except in fixed patterns that require こと.