A1 noun 中性

理由

/ɾijɯː/

A noun used to explain the cause, motive, or justification for an action, event, or belief. It is the answer to the question 'why' (naze/nande) and is used in both formal and informal contexts.

例句

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1

学校を休んだ理由は何ですか?

What is the reason you were absent from school?

2

不参加の理由を詳しくご説明いたします。

I will explain the reason for my non-attendance in detail.

3

特に理由はないけど、なんとなく。

There is no particular reason, just because.

词族

名词
理由
相关
理由書
💡

记忆技巧

Remember 'RI' (Logic/Truth) and 'YUU' (Origin). It is the 'Logic' of the 'Origin' of an action.

快速测验

遅刻した____を先生に話しました。

正确!

正确答案是: 理由

例句

1

学校を休んだ理由は何ですか?

everyday

What is the reason you were absent from school?

2

不参加の理由を詳しくご説明いたします。

formal

I will explain the reason for my non-attendance in detail.

3

特に理由はないけど、なんとなく。

informal

There is no particular reason, just because.

4

この実験結果には三つの主要な理由が考えられる。

academic

Three main reasons can be considered for these experimental results.

5

今回のプロジェクトを中止する正当な理由を述べてください。

business

Please state a justifiable reason for canceling this project.

词族

名词
理由
相关
理由書

常见搭配

理由を述べる to state a reason
正当な理由 a valid/justifiable reason
特別な理由 a special reason
理由を聞く to ask for a reason
納得できる理由 a convincing reason

常用短语

理由はどうあれ

whatever the reason may be

理由のいかんを問わず

regardless of the reasons

これといった理由はない

there is no specific reason

容易混淆的词

理由 vs 原因

Riyuu is used for human motives or justifications; Gen'in is used for objective scientific or mechanical causes.

理由 vs わけ

Wake is more conversational and can imply a complex set of circumstances behind a situation.

📝

使用说明

Riyuu is a neutral noun that can be used in almost any situation. It is frequently followed by the particle 'wa' (wa) or 'ga' (ga) when introducing the reason itself.

⚠️

常见错误

Learners often try to use 'naze' (why) as a noun. Remember that 'naze' is an adverb used to ask questions, while 'riyuu' is the noun meaning 'the reason'.

💡

记忆技巧

Remember 'RI' (Logic/Truth) and 'YUU' (Origin). It is the 'Logic' of the 'Origin' of an action.

📖

词源

A compound of Chinese origin: 理 (ri) meaning 'logic/reason' and 由 (yuu) meaning 'from/source'.

语法模式

Noun/Verb + [の] 理由 理由は [Sentence] + からです
🌍

文化背景

In Japan, giving a clear reason is seen as a sign of respect and politeness when turning down an invitation or explaining a mistake.

快速测验

遅刻した____を先生に話しました。

正确!

正确答案是: 理由

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