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B1 conjunction #1,200 le plus courant 9 min de lecture

なぜなら

nazenara Top 1,200

Entraîne-toi Exemples Notes et astuces なぜなら en 30 secondes

Explication なぜなら in your Level:

At the A1 level, you usually learn to say 'because' using the word 'kara' at the end of a sentence. 'Nazenara' is much more advanced and formal. You can think of it as a special way to start a sentence when you want to explain 'why.' For now, just remember that it means 'Because...' and it is used at the beginning of a sentence. It is like saying 'The reason is...' in English. You won't use it much when talking to friends, but you might see it in simple stories or signs. It always needs a 'kara' or 'desu' at the end of the sentence to be complete. For example: 'I like apples. Nazenara, they are sweet.'

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At the A2 level, you are starting to connect sentences more logically. 'Nazenara' is a formal conjunction that helps you do this. It is used to introduce a reason for something you just said. A key rule for A2 learners is the 'sandwich' rule: if you start with 'Nazenara,' you must end with 'kara desu' (polite) or 'kara da' (plain). This makes your Japanese sound much more organized. You might use this in a simple speech or a letter to a teacher. It's more formal than just using 'kara' to join two parts of one sentence. It helps you emphasize the reason.

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At the B1 level, you should be comfortable using 'Nazenara' in formal writing and speeches. This is the level where logical structure becomes important. 'Nazenara' allows you to use the 'Result-Reason' order, which is very common in professional Japanese. Instead of saying 'Because I was sick, I stayed home,' you say 'I stayed home. Nazenara, I was sick.' This highlights the result first. You should also be aware of the nuance: 'Nazenara' sounds intellectual and deliberate. It is often used in JLPT N3 reading passages to explain the author's viewpoint. Make sure to always pair it with '〜からだ' or '〜のだ'.

At the B2 level, 'Nazenara' is a standard tool for constructing arguments in essays (shōrunbun) and business reports. You should understand the subtle difference between 'Nazenara' and its alternatives like 'naze ka to iu to' or 'to iu no mo.' 'Nazenara' is strictly logical and often used to provide a definitive cause. You should also be able to use it with more complex endings like '〜からにほかならない' (is none other than because). At this level, you use 'Nazenara' to manage the flow of information, ensuring that your reader understands the 'what' before you explain the 'why.' It is essential for academic fluency.

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At the C1 level, you use 'Nazenara' with stylistic precision. You understand that it can be used to create a rhetorical pause, inviting the reader to consider the 'why' before it is revealed. You are also aware of its historical context as a translation device for Western logic. You can distinguish between its use in legal texts, where it provides a strict causal link, and in literature, where it might be used to reveal a character's internal logic. You rarely make the mistake of using it in casual speech, and you can seamlessly switch to 'naze ka to iu to' in high-level spoken discourse to maintain a professional yet engaging tone.

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At the C2 level, 'Nazenara' is part of your mastery of Japanese rhetoric. You can use it to structure complex philosophical or technical arguments, often pairing it with sophisticated grammatical structures to express nuance, such as '〜からといって〜わけではない' (just because... doesn't mean...). You understand its role in the evolution of modern Japanese prose and can critique its usage in various media. For a C2 speaker, 'Nazenara' is not just a vocabulary word; it is a structural element that you use to manipulate the rhythm and logic of your discourse, ensuring that your communication is both authoritative and perfectly suited to the most formal environments.

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Entraîne-toi Exemples Notes et astuces

なぜなら en 30 secondes

Formal conjunction meaning 'because' or 'the reason is.'
Starts a new sentence to explain the previous one.
Must end with 'kara da' or 'no da' for grammatical completeness.
Common in news, essays, and professional speeches.

The Japanese conjunction なぜなら (nazenara) is a sophisticated logical connector that translates most accurately to "because," "the reason is," or "for." Unlike the basic conjunctions から (kara) or ので (node), which typically join two clauses within a single sentence, なぜなら almost always appears at the beginning of a new sentence to explain the statement that immediately preceded it. It is a hallmark of formal, written, or academic Japanese, signaling a clear transition from a result or observation to its underlying cause. Linguistically, the word is a compound of なぜ (naze), meaning "why," and なら (nara), the conditional form of the copula, which can be interpreted as "if it is." Therefore, the literal sense is "If [you ask] why [it is so]," which perfectly encapsulates its function as a rhetorical bridge. English speakers often find it useful when they want to sound more organized, persuasive, or professional in their Japanese communication.

Grammatical Category: Conjunction (接続詞 - Setsuzokushi)
Formality Level: Formal / Literary (often used in essays, news, and speeches)

彼は今日、欠席しています。なぜなら、ひどい風邪をひいているからです。

Translation: He is absent today. The reason is that he has a terrible cold.

In daily conversation, Japanese speakers might prefer the more casual だって (datte) or simply ending a sentence with 〜から (kara). However, なぜなら is indispensable in contexts where logic must be laid out explicitly. For example, in a business presentation, one might state a decline in sales and then follow up with なぜなら to introduce the market analysis. This structure allows the listener to first absorb the primary fact before being burdened with the explanation. It mirrors the English rhetorical style of stating a thesis and then supporting it with evidence. Furthermore, using なぜなら requires a specific grammatical "echo" at the end of the sentence—usually 〜からだ (kara da) or 〜のだ (no da). This creates a cohesive logical unit that is highly valued in Japanese prose. Without this ending, the sentence feels incomplete, like a question left hanging. Mastering this word is a significant step for B1 learners moving toward B2, as it demonstrates an ability to structure complex thoughts beyond simple subject-verb-object patterns.

Historically, the use of なぜなら became more prominent during the Meiji era as Japanese scholars sought ways to translate Western logical and philosophical texts. The need for a direct equivalent to the English "because" or the French "car" led to the standardization of such conjunctions. Today, it remains a vital tool for anyone reading Japanese newspapers like the Asahi Shimbun or listening to NHK news. It provides a sense of gravity and intellectual rigor to the discourse. When you use it, you aren't just giving an excuse; you are providing a reasoned explanation. This distinction is crucial in professional environments where 'why' is just as important as 'what.'

Using なぜなら (nazenara) correctly involves more than just placing it at the start of a sentence; it requires a specific grammatical framework known as "sentence-final correspondence" (呼応 - koō). When a sentence begins with なぜなら, the listener or reader expects the sentence to conclude with a reason-marking auxiliary. The most common endings are 〜からだ (kara da), 〜からです (kara desu), 〜のだ (no da), or 〜のである (no de aru). This pairing is non-negotiable in standard formal Japanese. If you omit the ending, the sentence sounds grammatically broken, much like saying "The reason is because..." and then failing to finish the thought in English.

The Standard Pattern: [Statement]. なぜなら、[Reason] + からだ。

この計画は中止すべきです。なぜなら、予算が足りないからだ。

Translation: This plan should be cancelled. The reason is that the budget is insufficient.

One of the primary advantages of using なぜなら is that it allows for the "Result-Reason" order. In basic Japanese, we often use the "Reason-Result" order: 予算が足りないから、中止します (Yosan ga tarinai kara, chūshi shimasu). While this is perfectly correct, it places the most important information (the cancellation) at the end. In formal writing or high-stakes communication, you often want to lead with your conclusion to grab attention. なぜなら facilitates this by allowing the conclusion to stand as its own sentence, followed by the justification. This is particularly effective in argumentative essays (小論文 - shōrunbun) where clarity of thesis is paramount.

Consider the nuance of politeness. While なぜなら is formal, the ending must match the overall politeness level of your speech. If you are speaking politely to a superior, you should use 〜からです (kara desu) or 〜なのです (na no desu). If you are writing an essay, 〜からだ (kara da) or 〜である (de aru) is appropriate. Mixing a formal starter like なぜなら with a casual ending like 〜から (kara) without the copula da/desu is a common mistake for learners. Always ensure the 'sandwich' is complete. Furthermore, なぜなら is rarely used in spoken conversation between friends. In that context, it can sound overly dramatic or like you are reading from a textbook. For daily life, stick to 〜から (kara) at the end of the sentence or だって (datte) at the beginning.

Polite Usage: [Statement]. なぜなら、〜からです。
Written/Plain Usage: [Statement]. なぜなら、〜からだ。

You are most likely to encounter なぜなら (nazenara) in structured environments where information is being presented logically. This includes television news broadcasts, documentaries, academic lectures, and business reports. When an NHK news anchor explains a government policy, they will often state the policy first and then use なぜなら to detail the rationale provided by officials. This creates a clear, authoritative tone that distinguishes factual reporting from casual chatter. In documentaries, the narrator uses it to link historical events to their causes, providing a narrative thread that is easy for the audience to follow.

政府は増税を決定しました。なぜなら、社会保障費が増大しているからです。

Translation: The government decided to increase taxes. This is because social security costs are rising.

In the world of literature, especially in non-fiction and detective novels, なぜなら is a favorite tool for authors to build suspense or provide a logical payoff. A detective might reveal the culprit and then say, "I knew it was him. なぜなら, his alibi was physically impossible." Here, the word acts as a signal that the mystery is about to be solved through pure deduction. In academic writing, it is used to connect a hypothesis to the experimental data that supports it. Students are taught to use it in their university entrance exams to show they can construct a coherent argument.

Interestingly, you will rarely hear なぜなら in anime or manga unless a character is specifically portrayed as being highly intelligent, formal, or perhaps a bit arrogant. A scientist character or a stern teacher might use it to emphasize their logical superiority. If a protagonist uses it, it often signals a moment of serious realization or a dramatic speech. In contrast, if you were to use it while drinking with Japanese friends, they might laugh and ask why you are being so stiff. Understanding the "social geography" of this word—where it belongs and where it doesn't—is key to achieving natural-sounding Japanese fluency. It is a word of the head, not the heart.

Common Contexts: News reports, Editorials, Textbooks, Business presentations, Legal documents.

The most frequent mistake learners make with なぜなら (nazenara) is forgetting the mandatory sentence-final particle. Because English uses "because" as a simple conjunction, learners often translate directly: *なぜなら、雨が降る (*Nazenara, ame ga furu). In Japanese, this is ungrammatical. You must include からだ (kara da) or an equivalent. The correct form is なぜなら、雨が降るからだ (Nazenara, ame ga furu kara da). Think of なぜなら as an opening bracket that must always be closed by a 'reason' particle at the end of the sentence.

❌ なぜなら、彼は忙しい。
✅ なぜなら、彼は忙しいからだ。

Another common error is using なぜなら in casual conversation. As mentioned, this word carries a heavy, formal weight. If a friend asks why you didn't come to the party and you respond with なぜなら, it sounds like you are delivering a formal apology in a courtroom. For casual situations, use だって (datte) or just 〜から (kara). Conversely, in formal writing, avoid using だって, as it is considered childish. Choosing the wrong register can make you sound either overly stiff or unintentionally rude.

A third mistake involves the placement of the word. なぜなら should start the sentence that contains the reason. Some learners try to put it in the middle of a sentence like the English "because." For example: *私は学校に行かない、なぜなら病気だ (*Watashi wa gakkō ni ikanai, nazenara byōki da). While this might be understood, it is much more natural to split them: 私は学校に行かない。なぜなら病気だからだ (Watashi wa gakkō ni ikanai. Nazenara byōki da kara da). In Japanese, the period (。) is your friend when using this conjunction. It provides the necessary pause for the logical transition to take place.

Mistake: Wrong Order: Using 'nazenara' to introduce a result (should be 'dakara').
Mistake: Missing Ending: Forgetting 'kara da' or 'no da' at the end of the sentence.

Japanese has several ways to express "because," and choosing the right one depends entirely on the context and the level of formality you wish to convey. なぜなら (nazenara) sits at the formal end of the spectrum. Its most direct formal competitor is なぜかというと (naze ka to iu to). This phrase literally means "If I were to say why..." and is arguably even more common in spoken formal contexts, such as interviews or presentations, because it feels slightly more explanatory and less like a written document.

なぜかというと (Naze ka to iu to): Very formal, common in speeches. 'The reason is that...'
というのも (To iu no mo): Slightly less formal than 'nazenara'. Used to add an after-the-fact explanation.

旅行は延期しました。というのも、台風が近づいているからです。

Translation: The trip was postponed. That's because a typhoon is approaching.

For casual situations, だって (datte) is the go-to word. It is often used by children or in close friendships to give an excuse. It carries a nuance of "but..." or "because..." and is very informal. Using なぜなら in a situation where だって is appropriate would make you sound like a robot. Another alternative is ですから (desu kara) or だから (dakara). While these are usually translated as "therefore," they can sometimes function similarly to "because" when used to start a sentence that justifies a previous action, though they focus more on the result than the cause.

Finally, we have the simple conjunctions から (kara) and ので (node). These are the workhorses of the Japanese language. They are used within a sentence to link cause and effect. Kara is more subjective and focuses on the speaker's reasoning, while node is more objective and focuses on the natural cause. なぜなら essentially takes the function of kara and elevates it to a formal, sentence-starting position. When you want to sound sophisticated, choose なぜなら. When you want to be clear and direct, use kara or node. When you are making an excuse to a friend, use datte.

Summary of Alternatives: Formal: なぜなら、なぜかというと
Neutral: というのも、〜からだ
Casual: だって、〜から

How Formal Is It?

Le savais-tu ?

During the Meiji period, 'nazenara' was heavily used to translate Western logical structures that didn't have a natural equivalent in Japanese, helping to create modern Japanese intellectual prose.

Guide de prononciation

UK /naze nɑːra/

US /nɑzeɪ nɑrə/

Japanese is a pitch-accent language. 'Nazenara' typically has a relatively flat pitch, but 'naze' may have a slight drop after the first syllable.

Rime avec

nara (if) kara (from) tara (cod/if) sara (plate) hara (belly) kura (warehouse) tera (temple) mura (village)

Erreurs fréquentes

Pronouncing 'naze' like 'nays' (rhyming with days). It should be two syllables: na-ze.
Stressing the 'ra' at the end. Keep it light.
Blending it into one word without a slight pause after 'nazenara'.
Pronouncing 'nara' like the English name 'Nora'.
Missing the short 'e' sound in 'ze'.

Niveau de difficulté

Lecture 3/5

Easy to recognize in text, but requires understanding the logical flow.

Écriture 4/5

Difficult to remember the 'sandwich' rule and use the correct ending.

Expression orale 4/5

Hard to use naturally without sounding overly stiff.

Écoute 2/5

Very clear and easy to hear in formal broadcasts.

Quoi apprendre ensuite

Prérequis

なぜ (naze) から (kara) ので (node) だ (da) です (desu)

Apprends ensuite

なぜかというと (naze ka to iu to) というのも (to iu no mo) ゆえに (yue ni) したがって (shitagatte) それゆえ (sore yue)

Avancé

〜からにほかならない (kara ni hokanaranai) 〜といわざるをえない (to iwazaru wo enai) 〜に起因する (ni kiin suru)

Grammaire à connaître

Sentence-final correspondence (呼応)

なぜなら〜からだ。

Explanatory 'no da' (のだ)

なぜなら、雨が降ったのだ。

Conditional 'nara' (なら)

明日が雨なら、行きません。

Causal conjunction 'kara' (から)

暑いから、窓を開けます。

Formal copula 'de aru' (である)

なぜなら、それは真実である。

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Exemples par niveau

私は猫が好きです。なぜなら、かわいいからです。

I like cats. Because they are cute.

Starts with 'nazenara' and ends with 'kara desu'.

今日は休みます。なぜなら、病気だからです。

I will rest today. Because I am sick.

Used to give a reason for an absence.

水泳が好きです。なぜなら、楽しいからです。

I like swimming. Because it is fun.

Explaining a hobby.

日本語を勉強します。なぜなら、日本に行きたいからです。

I study Japanese. Because I want to go to Japan.

Expressing a goal.

野菜を食べます。なぜなら、体にいいからです。

I eat vegetables. Because they are good for the body.

Explaining a healthy habit.

傘を持って行きます。なぜなら、雨だからです。

I will take an umbrella. Because it is raining.

Providing a reason for an action.

早く寝ます。なぜなら、明日テストがあるからです。

I will go to bed early. Because there is a test tomorrow.

Reason for sleeping early.

この本は面白いです。なぜなら、絵がきれいだからです。

This book is interesting. Because the pictures are beautiful.

Describing a book's quality.

彼は人気があります。なぜなら、とても親切だからです。

He is popular. Because he is very kind.

Explaining a person's character.

この町は静かです。なぜなら、車が少ないからです。

This town is quiet. Because there are few cars.

Describing an environment.

料理を習っています。なぜなら、将来レストランを開きたいからです。

I am learning cooking. Because I want to open a restaurant in the future.

Connecting a current action to a future dream.

窓を閉めました。なぜなら、外がうるさいからです。

I closed the window. Because it is noisy outside.

Immediate reason for an action.

彼は毎日走っています。なぜなら、健康になりたいからです。

He runs every day. Because he wants to become healthy.

Reason for a daily routine.

このカメラは高いです。なぜなら、性能がいいからです。

This camera is expensive. Because the performance is good.

Justifying a price.

牛乳を飲みません。なぜなら、嫌いだからです。

I don't drink milk. Because I hate it.

Stating a preference.

彼女は幸せそうです。なぜなら、欲しかった靴を買ったからです。

She looks happy. Because she bought the shoes she wanted.

Explaining an emotional state.

このプロジェクトは成功するでしょう。なぜなら、準備が完璧だからです。

This project will likely succeed. The reason is that the preparation is perfect.

Using 'nazenara' in a professional context.

彼は信頼されています。なぜなら、一度も約束を破ったことがないからです。

He is trusted. Because he has never broken a promise.

Providing evidence for a character trait.

そのニュースは嘘だと思われます。なぜなら、証拠が一つもないからです。

That news is thought to be a lie. The reason is that there is not a single piece of evidence.

Expressing an opinion with logical support.

環境保護は重要です。なぜなら、地球の未来を守る必要があるからです。

Environmental protection is important. Because we need to protect the Earth's future.

Formal argument for a social issue.

彼女は留学を決めました。なぜなら、広い世界を見たいと思ったからです。

She decided to study abroad. Because she thought she wanted to see the wider world.

Explaining a major life decision.

この薬は注意が必要です。なぜなら、副作用があるからです。

This medicine requires caution. The reason is that there are side effects.

Providing a safety warning.

彼は怒っています。なぜなら、秘密をバラされたからです。

He is angry. Because his secret was revealed.

Explaining the cause of an emotion.

祭りは中止になりました。なぜなら、大雨が予想されているからです。

The festival was cancelled. The reason is that heavy rain is expected.

Formal announcement of a cancellation.

この理論は広く受け入れられています。なぜなら、多くの実験によって証明されたからです。

This theory is widely accepted. The reason is that it was proven by many experiments.

Academic context with passive voice.

景気は回復傾向にあります。なぜなら、輸出が増加しているからです。

The economy is on a recovery trend. This is because exports are increasing.

Economic analysis.

彼はリーダーにふさわしい。なぜなら、冷静な判断力を持っているからだ。

He is suitable to be a leader. The reason is that he possesses calm judgment.

Justifying a qualification.

この地域は観光客に人気です。なぜなら、歴史的な建物が残っているからです。

This area is popular with tourists. Because historical buildings remain.

Describing a regional characteristic.

その法案は否決されました。なぜなら、国民の反対が強かったからです。

The bill was rejected. The reason is that public opposition was strong.

Political reporting.

彼は成功を収めました。なぜなら、誰よりも努力したからです。

He achieved success. Because he worked harder than anyone else.

Attributing success to effort.

この素材は建築に適しています。なぜなら、耐久性が非常に高いからです。

This material is suitable for construction. The reason is that its durability is very high.

Technical specification.

彼女の歌声は人々を魅了します。なぜなら、魂がこもっているからです。

Her singing voice fascinates people. Because her soul is in it.

Describing an artistic quality.

近代化は伝統を破壊したと言える。なぜなら、効率性が最優先されたからである。

It can be said that modernization destroyed tradition. The reason is that efficiency was prioritized.

Using 'de aru' for a formal academic tone.

この文学作品は不朽の名作だ。なぜなら、人間の本質を鋭く突いているからだ。

This literary work is an immortal masterpiece. Because it sharply pierces the essence of humanity.

Literary criticism.

格差社会は深刻な問題である。なぜなら、機会の平等が失われているからにほかならない。

The gap society is a serious problem. The reason is none other than the loss of equality of opportunity.

Using 'kara ni hokanaranai' for emphasis.

彼は沈黙を守った。なぜなら、真実を語ることが誰かを傷つけると知っていたからだ。

He remained silent. Because he knew that telling the truth would hurt someone.

Narrative prose exploring internal conflict.

この政策は再考の余地がある。なぜなら、長期的な視点が欠如しているからである。

This policy has room for reconsideration. The reason is that it lacks a long-term perspective.

Formal critique of a policy.

言語は文化を反映する。なぜなら、言葉は人々の思考を形作るからだ。

Language reflects culture. Because words shape people's thoughts.

Linguistic philosophy.

その企業は倒産した。なぜなら、放漫経営が続いていたからである。

The company went bankrupt. The reason is that reckless management had continued.

Business analysis.

科学の進歩は諸刃の剣である。なぜなら、人類に恩恵をもたらすと同時に、脅威にもなり得るからだ。

Scientific progress is a double-edged sword. Because while it brings benefits to humanity, it can also become a threat.

Complex logical structure.

民主主義の根幹は揺らいでいる。なぜなら、ポピュリズムが台頭し、理性的な対話が困難になっているからである。

The foundation of democracy is wavering. The reason is that populism is rising, making rational dialogue difficult.

High-level political discourse.

芸術の価値は市場価格では測れない。なぜなら、それは時代を超越した精神的営みだからである。

The value of art cannot be measured by market price. Because it is a spiritual endeavor that transcends time.

Philosophical aesthetic argument.

この判決は司法の独立を象徴している。なぜなら、政治的圧力に屈することなく、法の支配を貫いたからだ。

This verdict symbolizes the independence of the judiciary. Because it upheld the rule of law without succumbing to political pressure.

Legal and ethical analysis.

自己同一性の確立は困難な課題だ。なぜなら、我々は常に他者の視線にさらされ、変容を強いられているからである。

Establishing self-identity is a difficult task. Because we are constantly exposed to the gaze of others and forced to transform.

Psychological/Sociological theory.

宇宙の起源を探求することは、我々自身のルーツを知ることと同義である。なぜなら、我々の肉体を構成する元素は星の内部で生成されたからだ。

Exploring the origin of the universe is synonymous with knowing our own roots. Because the elements that compose our bodies were generated inside stars.

Scientific and philosophical synthesis.

この建築物は静寂を体現している。なぜなら、光と影の調和が計算し尽くされているからである。

This building embodies silence. Because the harmony of light and shadow has been thoroughly calculated.

Architectural criticism.

グローバル化は文化の均質化を招く恐れがある。なぜなら、強大な経済力がローカルな多様性を飲み込んでしまうからだ。

Globalization risks leading to the homogenization of culture. Because powerful economic forces swallow up local diversity.

Critical social theory.

歴史は勝者によって書かれる。なぜなら、敗者の声は往々にして抹殺される運命にあるからである。

History is written by the victors. Because the voices of the losers are often destined to be erased.

Historiographical observation.

Collocations courantes

なぜなら〜からだ

なぜなら〜のだ

なぜなら〜からです

なぜなら〜のである

なぜなら〜にほかならない

なぜなら〜という理由がある

なぜなら〜からに過ぎない

なぜなら〜ためだ

なぜなら〜わけだ

なぜなら〜はずだ

Phrases Courantes

なぜなら、そう決めたからです。

— Because I decided so. Used to show firm resolve.

私は辞めます。なぜなら、そう決めたからです。

なぜなら、それが真実だからだ。

— Because that is the truth. Used in dramatic or serious contexts.

私は彼を信じる。なぜなら、それが真実だからだ。

なぜなら、時間がないからです。

— Because there is no time. A common practical reason.

急ぎましょう。なぜなら、時間がないからです。

なぜなら、危険だからです。

— Because it is dangerous. A common warning.

入ってはいけません。なぜなら、危険だからです。

なぜなら、彼はプロだからだ。

— Because he is a professional. Justifying someone's skill.

彼は失敗しない。なぜなら、彼はプロだからだ。

なぜなら、ルールだからです。

— Because it is a rule. Used to explain regulations.

ここでは静かにしてください。なぜなら、ルールだからです。

なぜなら、夢があるからです。

— Because I have a dream. Explaining motivation.

私は頑張ります。なぜなら、夢があるからです。

なぜなら、必要だからだ。

— Because it is necessary. Stating a requirement.

これを買います。なぜなら、必要だからだ。

なぜなら、愛しているからです。

— Because I love you. A classic emotional reason.

あなたを助けます。なぜなら、愛しているからです。

なぜなら、それが私の仕事だからだ。

— Because that is my job. Stating duty.

私は行きます。なぜなら、それが私の仕事だからだ。

Souvent confondu avec

なぜなら vs だから (dakara)

Dakara introduces a result (Therefore), while Nazenara introduces a reason (Because).

なぜなら vs なので (nanode)

Nanode is a conjunction used within a sentence, while Nazenara starts a new sentence.

なぜなら vs だって (datte)

Datte is casual and often used for excuses; Nazenara is formal and used for logical reasons.

Expressions idiomatiques

"なぜなら、〜からにほかならない"

— It is none other than because... Used for strong emphasis.

彼が成功したのは、努力したからにほかならない。

Formal

"なぜなら、〜というわけではない"

— It's not because... (used to clarify a reason).

怒っているわけではない。なぜなら、心配しているからだ。

Neutral

"なぜなら、〜からといって"

— Just because... (often followed by a negative).

なぜなら、金持ちだからといって幸せとは限らない。

Formal

"なぜなら、〜からこそ"

— Precisely because... (emphasizing the reason).

なぜなら、失敗したからこそ学べたのだ。

Formal

"なぜなら、〜からにすぎない"

— It is merely because... (downplaying a reason).

なぜなら、偶然だったからにすぎない。

Formal

"なぜなら、〜からといわざるをえない"

— Must say it is because... (expressing a forced conclusion).

なぜなら、力不足だったからといわざるをえない。

Formal

"なぜなら、〜からというもの"

— Ever since... (focusing on a reason that started a trend).

なぜなら、彼が来てからというもの、全てが変わった。

Literary

"なぜなら、〜からして"

— Judging from the fact that... (using a specific point as a reason).

なぜなら、彼の態度からして怪しいからだ。

Neutral

"なぜなら、〜からには"

— Now that/Since... (showing a reason that leads to a duty).

なぜなら、約束したからには守るべきだからだ。

Formal

"なぜなら、〜からといっても過言ではない"

— It is no exaggeration to say it is because...

なぜなら、彼のおかげだからといっても過言ではない。

Formal

Facile à confondre

なぜなら vs なぜか (nazeka)

Both start with 'naze'.

Nazeka means 'for some reason' or 'somehow,' while Nazenara means 'the reason is.'

なぜか、今日は体が重い。 (For some reason, my body feels heavy today.)

なぜなら vs なぜ (naze)

Nazenara contains 'naze'.

Naze is the question 'Why?', while Nazenara is the answer-starter 'Because...'

なぜ、彼は来ないのですか？ (Why isn't he coming?)

なぜなら vs ならば (naraba)

Both contain 'nara'.

Naraba means 'if so' or 'if that's the case,' while Nazenara introduces a reason.

雨ならば、中止です。 (If it rains, it's cancelled.)

なぜなら vs それなら (sorenara)

Both end in 'nara'.

Sorenara means 'in that case,' while Nazenara means 'because.'

それなら、私が行きます。 (In that case, I will go.)

なぜなら vs どうして (dōshite)

Both relate to 'why'.

Dōshite is a question word; Nazenara is a conjunction for providing answers.

どうして泣いているの？ (Why are you crying?)

Structures de phrases

[Result]。なぜなら、[Reason]からです。

日本に行きたいです。なぜなら、寿司が好きだからです。

[Result]。なぜなら、[Reason]からだ。

彼は来ない。なぜなら、忙しいからだ。

[Result]。なぜなら、[Reason]のだ。

道が濡れている。なぜなら、雨が降ったのだ。

[Result]。なぜなら、[Reason]ためである。

輸出が増えた。なぜなら、円安が進んだためである。

[Result]。なぜなら、[Reason]という理由がある。

彼は辞めた。なぜなら、留学するという理由がある。

[Result]。なぜなら、[Reason]からにほかならない。

彼が勝ったのは、努力したからにほかならない。

[Result]。なぜなら、[Reason]からといっても過言ではない。

彼は天才だ。なぜなら、誰もできないことをしたからといっても過言ではない。

[Result]。なぜなら、[Reason]ことに起因する。

問題が発生した。なぜなら、不注意な管理に起因する。

Famille de mots

Apparenté

ならば (naraba) - if so

なる (naru) - to become

どうして (dōshite) - why/how

なんで (nande) - why (casual)

ゆえに (yue ni) - therefore

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Comment l'utiliser

frequency

High in written media, moderate in formal speech, low in casual speech.

Erreurs courantes

Using 'nazenara' without 'kara da' at the end. → なぜなら、雨が降るからだ。
In Japanese, 'nazenara' is a 'correlative' conjunction that requires a matching particle at the end of the sentence to complete the logical thought.
Using 'nazenara' in casual conversation with friends. → だって、忙しいんだもん。
'Nazenara' is very formal. Using it casually sounds stiff and unnatural, like using 'furthermore' in a casual chat.
Confusing 'nazenara' with 'dakara'. → 雨が降った。だから、道が濡れている。
'Dakara' introduces a result (Therefore). 'Nazenara' introduces a reason (Because). They are opposites in terms of logical direction.
Putting 'nazenara' in the middle of a sentence. → 学校を休む。なぜなら、病気だからだ。
'Nazenara' must start a new sentence. It cannot be used like the English 'because' to join two clauses with a comma.
Using 'nazenara' to apologize for a small mistake. → ごめん、遅れた！電車が止まっちゃって。
Using 'nazenara' in an apology can make it sound like a cold, calculated excuse rather than a sincere 'I'm sorry.'

Astuces

The Sandwich Rule

Always remember that 'nazenara' is the first slice of bread and 'kara da' is the second. You need both to make a complete 'reason sandwich.' If you forget the ending, your sentence will feel unfinished.

Lead with the Result

Use 'nazenara' when you want to make a strong impact by stating your conclusion first. This is a powerful technique in persuasive writing and formal presentations to grab the audience's attention immediately.

Formal Situations Only

Save 'nazenara' for speeches, essays, and business meetings. In casual settings, it can make you sound like a textbook. Use 'kara' or 'datte' when talking to friends to keep the conversation natural.

Signal for Logic

When you hear 'nazenara' in a news report, it's a signal to pay close attention. The most important explanatory information is coming next. It helps you mentally categorize the information as 'the cause.'

Avoid Overuse

While 'nazenara' is useful, using it at the start of every sentence can make your writing feel repetitive and heavy. Mix it up with other connectors like 'to iu no mo' or 'naze ka to iu to' to keep your prose flowing.

Pitch Accent

Keep your pitch relatively flat when saying 'nazenara.' Don't over-emphasize any particular syllable. A natural, steady delivery reinforces the logical and calm nuance of the word.

Kanji Awareness

Even though it's usually hiragana, knowing the kanji 何故 (naze) helps you remember that the word is fundamentally about 'reasons' (故 means 'reason' or 'circumstance').

Logical Clarity

Using 'nazenara' shows that you are making an effort to be clear and logical. In a culture that often values indirectness, this word is a tool for direct, unambiguous communication.

JLPT Strategy

In JLPT reading sections, 'nazenara' is a 'keyword.' It often points directly to the answer of a 'Why?' question. Circle it whenever you see it in a passage to help you find key information quickly.

Mock Seriousness

If you want to be funny with friends, you can use 'nazenara' to give a very silly reason for something. It creates a humorous contrast between the formal word and the casual topic.

Mémorise-le

Moyen mnémotechnique

Think of 'Naze' (Why) and 'Nara' (If). 'Why? If you ask...' It's the bridge that leads you to the reason.

Association visuelle

Imagine a bridge between two islands. The first island is the 'Result' and the second is the 'Reason.' 'Nazenara' is the bridge you cross to get to the 'Reason.'

Word Web

Reason Logic Formal Because Explanation Argument Writing Speech

Défi

Try to write three sentences about your favorite food using 'nazenara.' Make sure to end each sentence with 'kara desu!'

Origine du mot

The word is a combination of 'naze' (何故), meaning 'why', and 'nara' (なら), which is the conditional form of the auxiliary verb 'da' (the copula). It literally means 'if it is why.'

Sens originel : If you ask why; if it be for the reason that.

Japonic

Contexte culturel

Avoid using 'nazenara' when apologizing for a personal mistake to a close friend; it can sound like you are making excuses rather than showing genuine regret.

English speakers are used to starting sentences with 'Because,' but in Japanese, 'nazenara' is much more formal than the English 'Because.'

Used frequently in 'Detective Conan' (Case Closed) when explaining deductions. A staple in NHK News reports. Common in the writings of Natsume Soseki and other Meiji-era authors.

Pratique dans la vie réelle

Contextes réels

Academic Writing

なぜなら、〜からである。
なぜなら、〜という事実があるからだ。
なぜなら、〜ことが証明されているからだ。
なぜなら、〜という背景がある。

Business Presentations

なぜなら、コストが削減できるからです。
なぜなら、市場が拡大しているからです。
なぜなら、顧客のニーズがあるからです。
なぜなら、競合他社がいないからです。

News Reporting

なぜなら、政府が発表したからです。
なぜなら、事故が発生したからです。
なぜなら、天候が悪化したからです。
なぜなら、法律が改正されたからです。

Detective Novels

なぜなら、彼にはアリバイがないからだ。
なぜなら、凶器が見つかったからだ。
なぜなら、彼が嘘をついたからだ。
なぜなら、証言が矛盾しているからだ。

Speeches/Lectures

なぜなら、皆さんに知ってほしいからです。
なぜなら、それが大切だからです。
なぜなら、歴史が教えてくれるからです。
なぜなら、未来を変えたいからです。

Amorces de conversation

"「なぜなら」を会話で使うのは、どんな時だと思いますか？"

"あなたが最近「なぜなら」を使って説明したことは何ですか？"

"「なぜなら」と「だって」の違いを説明できますか？"

"ビジネスの場面で「なぜなら」を使うメリットは何でしょうか？"

"日本語の作文で「なぜなら」を使う時の注意点は何ですか？"

Sujets d'écriture

最近、一番嬉しかったことを書いてください。なぜなら、どうして嬉しかったのかも詳しく説明してください。

あなたが尊敬する人を一人選んでください。なぜなら、その人のどんなところが素晴らしいと思うからですか？

日本語を勉強している理由を書いてください。なぜなら、将来の夢と関係がありますか？

自分の国で一番おすすめの場所を紹介してください。なぜなら、そこにはどんな魅力があるからですか？

もし魔法が使えたら何をしたいですか？なぜなら、その願いにはどんな理由があるからですか？

Questions fréquentes

10 questions

It's generally too formal for casual texting. Using it might make you sound like you're being overly dramatic or stiff. Stick to 'kara' or 'datte' instead. However, if you're writing a long, serious message explaining a difficult decision, it might be appropriate.

Almost always. In standard Japanese, 'nazenara' requires a 'reason' marker at the end of the sentence to be grammatically complete. This is usually 'kara da,' 'kara desu,' 'no da,' or 'no desu.' Omitting it is a common mistake for learners.

'Naze ka to iu to' is even more formal and is very common in spoken presentations and interviews. It literally means 'If I were to say why...' and feels slightly more explanatory. 'Nazenara' is more common in written texts.

No, 'nazenara' is a sentence-initial conjunction. It should start a new sentence after a period. If you want to connect two clauses in one sentence, use 'kara' or 'node' instead.

Yes, it is typically introduced at the N3 level, but it is essential for N2 and N1 reading comprehension and essay writing. It's a key word for anyone aiming for B1 level and above.

It can be written as 何故なら, but it is much more commonly written in hiragana as なぜなら in modern Japanese. Using kanji can make it look even more formal or slightly archaic.

While 'nazenara... node desu' is occasionally heard, it is much more standard and grammatically 'correct' to use 'nazenara... kara desu.' 'Kara' specifically marks a reason, which matches the function of 'nazenara' better.

'Datte' is softer, more emotive, and easier to say. 'Nazenara' is a logical, structured word that children haven't usually mastered yet. 'Datte' also carries a nuance of 'but...', which is common in children's excuses.

Yes, it is very common in business emails when you need to provide a clear, logical explanation for a decision or a delay. It shows that you have thought through the situation carefully.

Not necessarily. It can introduce a subjective reason or an opinion, but the structure itself implies that the speaker is presenting their reason as a logical justification.

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