なぜならば en 30 secondes
- A formal conjunction meaning 'This is because.'
- Used at the start of a sentence to explain the previous statement.
- Requires a sentence ending like 'kara da' or 'no da'.
- Common in academic writing, news, and formal speeches.
The conjunction なぜならば (nazenaraba) is a formal logical connector used to introduce a reason or justification for a statement previously made. In English, it is most closely translated as "This is because," "The reason for this is," or "For the reason that." It functions as a bridge between a conclusion and its underlying cause, signaling to the reader or listener that a detailed explanation is forthcoming. Unlike the simple particle 'kara' which connects clauses within a single sentence, なぜならば usually appears at the beginning of a new sentence, creating a strong rhetorical pause that emphasizes the importance of the reason.
- Syntactic Role
- It acts as a sentence-initial conjunction. It requires the sentence it introduces to end with a specific explanatory form, most commonly
〜からだ,〜のだ, or〜のである. - Formal Nuance
- It carries a weight of authority and intellectual rigor. It is frequently found in academic writing, legal documents, and formal speeches where the speaker intends to demonstrate a clear logical progression.
「彼は成功した。なぜならば、誰よりも努力したからだ。」 (He succeeded. Because, he worked harder than anyone else.)
In terms of structure, なぜならば is composed of 'naze' (why), 'nara' (if/conditional), and 'ba' (conditional suffix). Historically, it literally means "If [you ask] why." This etymological root explains its function as a response to an implied question. When you use this word, you are essentially anticipating the audience's question of "Why is that so?" and providing the answer before they even have to ask.
「この計画は中止すべきです。なぜならば、予算が大幅に不足しているからです。」
- Comparison with なぜなら
- While
なぜならis also formal, the addition ofばmakes the expression even more stiff and literary. In modern spoken Japanese,なぜならis more common, whileなぜならばis reserved for the most formal written contexts.
Using なぜならば correctly requires attention to the entire sentence structure, not just the word itself. It follows a strict 'Conclusion -> なぜならば -> Reason + Ending' pattern. The most critical aspect for learners is the mandatory sentence-ending particle. Without 〜からだ (or its variants), the sentence feels grammatically incomplete and jarring to a native speaker.
The Golden Rule of Grammar:
[Statement]. なぜならば、[Reason] + からだ / のだ / のである.
- Step 1: The Statement
- Start with a clear assertion. This can be a fact, an opinion, or a command. Example: 「私は日本が好きだ。」 (I like Japan.)
- Step 2: The Conjunction
- Place
なぜならばat the start of the next sentence, followed by a comma. This creates a rhetorical pause. - Step 3: The Reason and Ending
- State the reason and close with
からだ(plain),からです(polite), orのである(academic). Example: 「食べ物が美味しいからだ。」 (Because the food is delicious.)
In professional writing, such as a thesis or a business report, なぜならば is often paired with のである to create a tone of objective truth. In a debate, it is used to systematically dismantle an opponent's argument by providing clear counter-evidence. It is less about 'feeling' and more about 'proof.'
「この投資はリスクが高い。なぜならば、市場が不安定だからである。」
You are unlikely to hear なぜならば at a casual izakaya or during a chat with friends. It is a 'high-register' word. Its natural habitat is in environments where precision and formality are paramount. If you hear it in daily life, the speaker might be trying to sound overly intellectual, dramatic, or is perhaps delivering a prepared speech.
- 1. Academic Lectures & Papers
- Professors use it to explain complex theories. In written research papers (論文), it is a standard tool for justifying hypotheses.
- 2. News Editorials & Documentaries
- News anchors use it when analyzing the causes of social phenomena or political shifts. It provides a sense of gravity to the reporting.
- 3. Business Presentations
- When a CEO explains a company's strategy to shareholders,
なぜならばis used to link strategic decisions to market data.
「政府は増税を決定した。なぜならば、社会保障費が増大しているからだ。」
In modern digital communication (Twitter, LINE), なぜならば is almost never used unless for comedic effect or to mimic a formal 'persona.' If you are writing an email to a professor or a boss, it is appropriate, but even then, なぜなら (without the 'ba') is often sufficient and slightly less 'stiff.'
The most frequent errors involving なぜならば stem from its rigid grammatical requirements and its specific social register. Because it is a B1/B2 level word, learners often try to force it into sentences where it doesn't belong, or they forget the necessary 'tail' of the sentence.
- Mistake 1: Missing the 'Kara da'
❌ 「彼は来なかった。なぜならば、病気です。」
✅ 「彼は来なかった。なぜならば、病気だからだ。」
The logic requires a 'because' marker at the end to match the 'why' at the beginning.
- Mistake 2: Using it in Casual Conversation
❌ (To a friend) 「今日遊べない。なぜならば、宿題があるからだ。」
✅ 「今日遊べない。宿題があるから。」
Using such formal language with friends makes you sound like a textbook or a robot.
- Mistake 3: Misplacing the Conjunction
❌ 「雨が降ったなぜならば、傘を持っていった。」
✅ 「傘を持っていった。なぜならば、雨が降ったからだ。」
Remember: Result first, then
なぜならば, then Reason.
Register Mismatch:
Mixing なぜならば with casual endings like 〜だよ or 〜じゃん is a stylistic clash. Keep the whole sentence formal.
Japanese has many ways to express causality. Choosing the right one depends entirely on the level of formality and whether you are speaking or writing. Here is how なぜならば compares to its cousins.
- 1. なぜなら (Nazenara)
- The most direct synonym. It is slightly less formal than
なぜならば. It is the 'standard' formal way to start a reason sentence. If you aren't sure which to use in a business email,なぜならis usually the safer, more natural choice. - 2. というのも (To iu no mo)
- Very common in both polite speech and writing. It feels softer and more explanatory. It translates to "The reason being..." or "That's because...". It is less 'aggressive' in its logic than
なぜならば. - 3. なぜかというと (Naze ka to iu to)
- Literally "If I were to say why...". This is the most common version used in spoken presentations and interviews. It sounds professional but accessible. It bridges the gap between casual and academic.
- 4. だって (Datte)
- The casual, often childish, way to say "But..." or "Because...". Use this only with close friends or family. It often carries a nuance of making an excuse.
| Word | Formality | Main Use |
|---|---|---|
| なぜならば | Very High | Academic/Legal Writing |
| なぜなら | High | Business/Formal Writing |
| というのも | Medium-High | Polite Speech/Essays |
| だって | Low | Casual Conversation |
How Formal Is It?
Niveau de difficulté
Grammaire à connaître
〜から (Reason)
〜ので (Cause)
〜ため (Due to)
〜のだ (Explanatory ending)
〜のである (Formal explanatory ending)
Exemples par niveau
私はお茶を飲みます。なぜならば、好きだからです。
I drink tea. Because I like it.
A1 learners should focus on the 'kara desu' ending.
彼は学校へ行きません。なぜならば、休みだからです。
He doesn't go to school. Because it's a holiday.
Simple noun + dakara desu.
この本はいいです。なぜならば、面白いからです。
This book is good. Because it is interesting.
Adjective + kara desu.
野菜を食べます。なぜならば、体にいいからです。
I eat vegetables. Because they are good for the body.
Nazenaraba used for a simple health reason.
傘を買いました。なぜならば、雨だからです。
I bought an umbrella. Because it is raining.
Noun + dakara desu.
日本語を勉強します。なぜならば、日本へ行くからです。
I study Japanese. Because I am going to Japan.
Verb + kara desu.
早く寝ます。なぜならば、疲れたからです。
I will go to bed early. Because I am tired.
Past tense verb + kara desu.
猫が好きです。なぜならば、可愛いからです。
I like cats. Because they are cute.
Adjective + kara desu.
昨日は休みました。なぜならば、風邪をひいたからです。
I was absent yesterday. Because I caught a cold.
Verb phrase + kara desu.
この町は静かです。なぜならば、車が少ないからです。
This town is quiet. Because there are few cars.
Nazenaraba explaining a state.
毎日走ります。なぜならば、健康になりたいからです。
I run every day. Because I want to become healthy.
Tai-form (want to) + kara desu.
彼は怒っています。なぜならば、約束を破られたからです。
He is angry. Because a promise was broken.
Passive form + kara desu.
このレストランは人気です。なぜならば、安いからです。
This restaurant is popular. Because it is cheap.
Adjective + kara desu.
私はカメラを買わない。なぜならば、高いからです。
I won't buy a camera. Because it is expensive.
Negative statement followed by reason.
漢字を練習します。なぜならば、難しいからです。
I practice Kanji. Because it is difficult.
Nazenaraba used for motivation.
窓を閉めました。なぜならば、寒いからです。
I closed the window. Because it is cold.
Action followed by immediate reason.
環境保護は重要だ。なぜならば、地球の未来がかかっているからだ。
Environmental protection is important. Because the future of the Earth depends on it.
Formal 'da' ending used for a general truth.
彼はリーダーにふさわしい。なぜならば、決断力があるからだ。
He is suitable as a leader. Because he has decisiveness.
Nazenaraba used for evaluation.
この計画は見直すべきだ。なぜならば、予算が足りないからだ。
This plan should be reviewed. Because the budget is insufficient.
Should (beki) + Nazenaraba.
留学を決めました。なぜならば、異文化を学びたいからです。
I decided to study abroad. Because I want to learn about different cultures.
Personal decision in a formal context.
この薬は注意が必要だ。なぜならば、副作用があるからだ。
This medicine requires caution. Because there are side effects.
Warning + logical reason.
運動は欠かせない。なぜならば、ストレス解消になるからだ。
Exercise is indispensable. Because it helps relieve stress.
Nazenaraba used for health advice.
その説は間違いだ。なぜならば、証拠が不十分だからだ。
That theory is wrong. Because the evidence is insufficient.
Logical rebuttal.
彼は成功するだろう。なぜならば、決して諦めないからだ。
He will probably succeed. Because he never gives up.
Prediction + reason.
現代社会においてITスキルは必須である。なぜならば、あらゆる業務がデジタル化されているからだ。
IT skills are essential in modern society. Because all tasks are being digitized.
Formal 'de aru' and 'kara da' combination.
この政策は支持を得られないだろう。なぜならば、国民の負担が増えるからである。
This policy will likely not gain support. Because the burden on citizens will increase.
Using 'kara de aru' for a formal tone.
読書は人生を豊かにする。なぜならば、他者の視点を知ることができるからだ。
Reading enriches life. Because it allows one to know the perspectives of others.
Abstract concept explanation.
伝統文化を守るべきだ。なぜならば、それが民族のアイデンティティだからである。
Traditional culture should be protected. Because it is the identity of the people.
Noun + dakara de aru.
経済の活性化が必要だ。なぜならば、雇用を創出するためである。
Economic revitalization is necessary. Because it is for the purpose of creating jobs.
Tame (purpose) + de aru.
科学技術の発展は諸刃の剣だ。なぜならば、使い方次第で毒にも薬にもなるからだ。
The development of science and technology is a double-edged sword. Because it can be both poison and medicine depending on how it's used.
Metaphorical explanation.
教育格差を是正すべきだ。なぜならば、機会の平等が民主主義の根幹だからである。
The educational gap should be corrected. Because equality of opportunity is the foundation of democracy.
Political/Social argument.
睡眠は脳の掃除である。なぜならば、睡眠中に老廃物が排出されるからだ。
Sleep is the cleaning of the brain. Because waste products are discharged during sleep.
Scientific explanation.
自由主義経済は常に不安定さを内包している。なぜならば、市場の自己調節機能には限界があるからである。
Liberal economies always contain instability. Because there are limits to the market's self-regulating function.
Advanced economic discourse.
言語は単なる伝達手段ではない。なぜならば、それは思考そのものを規定する枠組みだからだ。
Language is not merely a means of communication. Because it is a framework that prescribes thought itself.
Philosophical assertion.
この歴史的転換点は必然であった。なぜならば、旧体制の矛盾が極限に達していたからである。
This historical turning point was inevitable. Because the contradictions of the old regime had reached their limit.
Historical analysis.
芸術の価値は主観的である。なぜならば、鑑賞者の経験や感性によって意味が変容するからだ。
The value of art is subjective. Because its meaning transforms depending on the viewer's experience and sensitivity.
Aesthetic theory.
倫理的な消費が求められている。なぜならば、個人の選択がグローバルなサプライチェーンに影響を及ぼすからである。
Ethical consumption is being demanded. Because individual choices affect global supply chains.
Global social issues.
民主主義の維持には市民の参加が不可欠だ。なぜならば、無関心は権力の腐敗を招くからだ。
Citizen participation is essential for maintaining democracy. Because indifference leads to the corruption of power.
Political philosophy.
AIの倫理規定を早急に策定すべきだ。なぜならば、技術の進歩が法整備を追い越しているからである。
Ethical regulations for AI should be formulated urgently. Because technological progress is overtaking legal frameworks.
Modern legal/tech debate.
幸福の定義は多様である。なぜならば、文化や宗教によって価値観が異なるからだ。
The definition of happiness is diverse. Because values differ depending on culture and religion.
Sociological observation.
存在論的問いは常に未完である。なぜならば、存在そのものが時間という流動性の中に置かれているからである。
Ontological questions are always incomplete. Because existence itself is placed within the fluidity of time.
Metaphysical/Philosophical discourse.
権力構造の解体は容易ではない。なぜならば、支配の論理が被支配者の内面にまで浸透しているからだ。
The dismantling of power structures is not easy. Because the logic of dominance permeates even the inner lives of the dominated.
Critical theory/Sociology.
法治国家の正当性は法の支配に依拠する。なぜならば、恣意的な権力行使を抑制することが法の本義だからである。
The legitimacy of a constitutional state relies on the rule of law. Because suppressing the arbitrary exercise of power is the true meaning of law.
Legal philosophy.
認識論的転回は知の地平を広げた。なぜならば、客体ではなく主体の構成作用に焦点を当てたからである。
The epistemological turn expanded the horizons of knowledge. Because it focused on the constitutive action of the subject rather than the object.
Epistemology.
資本主義の内的矛盾は止揚されねばならない。なぜならば、無限の成長という幻想が有限の地球資源と衝突しているからだ。
The internal contradictions of capitalism must be sublated. Because the illusion of infinite growth is colliding with finite Earth resources.
Marxist/Economic theory.
詩的言語は日常言語を超越する。なぜならば、それは意味の固定化を拒絶し、多義性を志向するからである。
Poetic language transcends everyday language. Because it rejects the fixation of meaning and aims for polysemy.
Literary theory.
歴史の記述は常に現在からの再解釈である。なぜならば、過去は常に現在の関心事によって照らし出されるからだ。
The description of history is always a reinterpretation from the present. Because the past is always illuminated by the concerns of the present.
Historiography.
生命の定義は境界線上で揺らいでいる。なぜならば、ウイルスやAIの存在が「生」の概念を再考させているからである。
The definition of life is wavering on the borderline. Because the existence of viruses and AI is forcing a reconsideration of the concept of 'life.'
Bioethics/Philosophy of Science.
Collocations courantes
Phrases Courantes
Souvent confondu avec
Slightly less formal, more common in modern writing.
Means 'if so' or 'then,' used to connect a condition to a result, not a result to a reason.
Means 'so' or 'therefore,' used to show the result, not the reason.
Expressions idiomatiques
Facile à confondre
Structures de phrases
Famille de mots
Apparenté
Comment l'utiliser
The 'kara' at the end is non-negotiable in standard grammar.
Strictly formal. Avoid in daily conversation.
Always starts a new sentence or follows a strong pause.
- Forgetting the 'kara' at the end of the sentence.
- Using it in casual conversation with friends.
- Using it to mean 'therefore' (confusing it with 'dakara').
- Starting a sentence with it without a previous statement to explain.
- Mixing it with very casual slang in the same sentence.
Astuces
The Ending Check
Always double-check your sentence ending. If you started with 'nazenaraba,' you must have a 'kara' or 'no da' at the end. It's like an open bracket that needs closing.
Don't Overuse
In a single paragraph, try not to use 'nazenaraba' more than once. Overuse makes your writing feel repetitive and overly aggressive in its logic.
The Pause
When speaking formally, use a short pause after 'nazenaraba.' This gives the listener time to prepare for the explanation and makes you sound more confident.
Logic Tracking
When you see 'nazenaraba' in a text, underline the sentence before it. That is the conclusion. The sentence starting with 'nazenaraba' is the evidence.
Business Reports
Use 'nazenaraba' when you need to explain a failure or a change in plan. It sounds objective and takes the 'personal' feel out of the explanation.
Synonym Choice
If 'nazenaraba' feels too stiff, use 'to iu no mo.' It provides the same logical link but feels much smoother and more modern.
Academic Tone
Pair 'nazenaraba' with 'no de aru' for the most professional academic tone possible. This is the gold standard for university-level essays.
News Cues
Listen for 'nazenaraba' in news analysis. It often introduces the 'expert opinion' part of the segment.
Anime Logic
Notice which characters use this word. It's a great way to understand their personality—usually someone who is calculated and intellectual.
The 'Why' If
Remember the literal translation: 'Why-If.' 'If you ask why, it is because...' This helps you remember both the meaning and the formal structure.
Mémorise-le
Origine du mot
Old Japanese / Classical Japanese
Contexte culturel
Often used by 'Megane' (glasses) characters who are overly logical.
Essential for the 'Ki-Sho-Ten-Ketsu' structure in formal essays.
Used in reports to explain financial losses or gains objectively.
Pratique dans la vie réelle
Contextes réels
Amorces de conversation
"なぜならば、という言葉をいつ使いますか？ (When do you use the word 'nazenaraba'?)"
"論文を書くとき、なぜならばを使いますか？ (Do you use 'nazenaraba' when writing a paper?)"
"「なぜなら」と「なぜならば」の違いは何だと思いますか？ (What do you think is the difference between 'nazenara' and 'nazenaraba'?)"
"日本のアニメで、この言葉を使うキャラを知っていますか？ (Do you know any anime characters who use this word?)"
"「だって」の代わりに「なぜならば」を使ったらどうなりますか？ (What happens if you use 'nazenaraba' instead of 'datte'?)"
Sujets d'écriture
Why did you start learning Japanese? Use 'Nazenaraba' in your answer.
What is your favorite food and why? Use formal Japanese.
Describe a goal you have. Explain the reason using 'Nazenaraba'.
Write a short argument for why people should travel more.
Explain why you like or dislike a certain movie using formal logic.
Questions fréquentes
10 questionsOnly in very formal situations like speeches or academic presentations. In normal conversation, it sounds too stiff and unnatural. People usually use 'kara' or 'naze ka to iu to' instead.
Technically, it is grammatically incomplete without an explanatory ending. While people might understand you, it will sound like a mistake. Always pair it with 'kara da', 'no da', or 'no de aru'.
They mean the same thing, but 'nazenaraba' is more formal and literary. 'Nazenara' is the standard formal version, while 'nazenaraba' adds an extra layer of stiffness often found in older texts or legal documents.
Yes, it is appropriate for formal reports or explaining serious issues. However, for regular internal communication, 'nazenara' or 'to iu no mo' might feel more natural.
Usually, yes. It is a sentence-initial conjunction. Sometimes it follows a semicolon or a long dash in writing, but its function remains to start the reason clause.
Yes, it typically appears in N3 and N2 reading sections. Understanding its structure is key to following the logic of formal Japanese passages.
Yes, you can say 'nazenaraba... kara desu' in polite speech. This is common in formal interviews or presentations.
Yes, but 'because' can be used in many ways. 'Nazenaraba' specifically matches 'This is because...' at the start of a sentence.
The 'ba' is a conditional marker. Historically, the word means 'if [one asks] why.' This structure is common in formal Japanese conjunctions.
Only if you are joking or trying to sound like a very serious character. Otherwise, it is far too formal for texting.
Teste-toi 180 questions
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Perfect score!
Summary
Nazenaraba is your go-to word for building a strong, formal logical argument in Japanese. It signals that you are about to provide the 'why' behind your 'what,' but remember: it always needs a 'kara' or 'no da' at the end to be grammatically correct.
- A formal conjunction meaning 'This is because.'
- Used at the start of a sentence to explain the previous statement.
- Requires a sentence ending like 'kara da' or 'no da'.
- Common in academic writing, news, and formal speeches.
The Ending Check
Always double-check your sentence ending. If you started with 'nazenaraba,' you must have a 'kara' or 'no da' at the end. It's like an open bracket that needs closing.
Don't Overuse
In a single paragraph, try not to use 'nazenaraba' more than once. Overuse makes your writing feel repetitive and overly aggressive in its logic.
The Pause
When speaking formally, use a short pause after 'nazenaraba.' This gives the listener time to prepare for the explanation and makes you sound more confident.
Logic Tracking
When you see 'nazenaraba' in a text, underline the sentence before it. That is the conclusion. The sentence starting with 'nazenaraba' is the evidence.
Contenu associé
Ce mot dans d'autres langues
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絶対的
B2Absolu ; qui ne comporte aucune restriction ni réserve. Il jouit d'une autorité absolue.
絶対的に
B1De manière absolue et inconditionnelle. 'C'est absolument nécessaire.'
抽象的だ
B1Abstract; existing in thought or as an idea but not having a physical or concrete existence.
抽象
B2Existant dans la pensée ou comme une idée mais n'ayant pas d'existence physique ou concrète. Il fait référence à la généralisation ou à l'extraction de l'essence de quelque chose, loin des détails spécifiques. (L'art abstrait est un exemple courant.)
抽象的に
B1De manière abstraite ou théorique. Utilisé pour des idées ou des concepts, pas pour des choses physiques.
学術的な
B1Relatif à l'étude, à la recherche ou à la science de haut niveau; académique.
学術的だ
B1Académique; relatif à l'éducation et à l'érudition. Cette recherche a une grande valeur académique.
学術的
B2Academic; relating to education and scholarship.
学術
B1L'académie, la recherche universitaire ; se rapportant aux études savantes.
学力
B1La capacité académique est le niveau de connaissances d'un étudiant.
