Grammar Rule in 30 Seconds
Use 'hence', 'thus', and 'accordingly' to link ideas with sophisticated logic in formal writing and professional speech.
- Use 'hence' to show a logical consequence or 'from this source' (e.g., 'The cost is high, hence the delay').
- Use 'thus' to mean 'in this way' or 'as a result' (e.g., 'He won, thus proving his critics wrong').
- Use 'accordingly' to show an action taken in response to a situation (e.g., 'The rules changed; we adapted accordingly').
Overview
hence、thus、accordingly は、日本語で言えば「したがって」「それゆえに」「それに応じて」といった、非常にフォーマルで論理的なつながりを示す接続副詞 (conjunctive adverbs) です。so や therefore を多用しがちですが、アカデミックな論文、法的文書、あるいは企業の年次報告書といった高度なコンテクストでは、これらの単語を使い分けることで、書き手の知性と論理の正確さを印象付けることができます。特に日本人の学習者にとって、これらの単語は「どれも同じ『だから』ではないか」と感じられがちですが、ネイティブスピーカーの感覚では、それぞれが指し示す「論理の方向性」や「ニュアンス」が明確に異なります。hence と thus は主に「結果や推論」を導き出しますが、accordingly は「状況に合わせた適切な対応」を示唆します。この微細な違いをマスターすることは、プロフェッショナルな世界での信頼を築く第一歩となるでしょう。本稿では、これら3つの単語の核心にあるニュアンスから、日本人が間違いやすい句読点（パンクチュエーション）の使い方まで、徹底的に解説します。and や but といった等位接続詞とは異なり、2つの節を直接繋ぐ力はありません。そのため、セミコロン (;) やピリオド (.) と組み合わせて使うのが鉄則です。hence、thus、accordingly も同様に文頭（または節の冒頭）に置かれますが、その「重み」が異なります。hence はラテン語の「ここから (from here)」に由来します。ある事実から、直接的かつ不可避的に導き出される結果や結論を指します。非常に硬い響きがあり、科学的な証明や数学的な帰結、あるいは法的な判断で好まれます。- イメージ: Aという事実がある。それゆえに（この理由によって）、Bという結論になる。
- 日本語のニュアンス: 「それゆえに」「それゆえに生じる」
thus は hence と似ていますが、より「方法（in this way）」や「文脈全体のまとめ（conclusion）」というニュアンスを含みます。単に「結果」を述べるだけでなく、「これまでの説明の通り、このようにして事態は進んだ」というプロセスを意識させる言葉です。- イメージ: Aというプロセスや状況があった。このようにして（その結果として）、Bとなった。
- 日本語のニュアンス: 「したがって」「このようにして」「左記の通り」
accordingly は、前の文で述べられた状況や指示に対して、「それにふさわしい」「それと一致する」行動や変化が起きたことを示します。hence や thus が「論理的な結果」にフォーカスするのに対し、accordingly は「状況への適応」にフォーカスします。- イメージ: Aという状況やルールが提示された。それに応じて（それに沿って）、Bという処置を取った。
- 日本語のニュアンス: 「それに応じて」「それを受けて」「適宜」
,) だけで2つの文を繋ぐことはできません（これをコンマ・スプライスと呼び、重大なミスと見なされます）。- [文1]; [hence / thus / accordingly], [文2].
The company failed to meet its targets; hence, the bonus pool was reduced.
- [文1]. [Hence / Thus / Accordingly], [文2].
The instructions were clear. Accordingly, we adjusted our workflow.
hence に特有の語法として、動詞を省略して直接名詞句を置く形があります。これは非常にフォーマル、あるいは文学的な表現です。The cost of labor is rising, hence the increase in prices.
hence は「〜の原因となる」というニュアンスを含んでいます。thus は、文の後にコンマを伴って -ing 形を導き、「その結果として〜することになる」という結果補足のような使い方ができます。The new software automates data entry, thus reducing the risk of human error.
hence や thus が不可欠です。The samples were contaminated during transport; hence, the results are unreliable.
By increasing the temperature, the reaction rate doubled. Thus, the hypothesis was confirmed.
accordingly が非常に有効です。相手への配慮や、ルールへの準拠を示します。The client requested a more detailed breakdown of costs. Accordingly, we have attached a revised proposal.
The board of directors has approved the merger. Accordingly, all departments must begin the integration process immediately.
The defendant was found to be in breach of contract. Hence, the plaintiff is entitled to damages.
hence などをコンマだけで繋ぐのは誤りです。- Bad:
The weather was bad, hence the flight was canceled. - Good:
The weather was bad; hence, the flight was canceled. - 解説: 日本語の感覚ではコンマで十分だと感じてしまいますが、英語では「独立した2つの文を繋ぐにはセミコロンかピリオドが必要」という厳格なルールがあります。
- Bad (to a friend):
I'm tired; thus, I won't go to the party. - Good:
I'm tired, so I'm not going to the party. - 解説: 日本語でも、友達に「疲れた。それゆえに私は宴会には行かない」と言わないのと同じです。C1レベルでは、状況に応じた「レジスター（言語域）」の使い分けが求められます。
accordingly を使ってしまうミスです。- 間違いやすい例:
He lost his key; accordingly, he couldn't enter the house. - 解説: 鍵をなくしたことは「ルールや指示」ではありません。単なる不運な結果です。この場合は
consequentlyやthusが適切です。accordinglyは「状況を汲み取って、意図的に何かを調整した」というニュアンスが必要な時に使いましょう。
hence の後にコンマは必ず必要ですか？; hence, ...）。ただし、前述の hence the name（それゆえの名称）のように、名詞句を直接導く短いフレーズではコンマを省略することが多いです。現代のビジネスライティングでは、読みやすさを重視してコンマを打つのが標準的です。thus と therefore は入れ替え可能ですか？thus の方が「このようにして（in this way）」という「手段・方法」のニュアンスが強いです。単に「AだからB」と言いたいだけなら therefore が安全ですが、これまでの説明を総括して「以上のプロセスを経て、このように結論づけられる」と言いたい時は thus がよりプロフェッショナルです。accordingly を文末に置くことはできますか？We will review your request and respond accordingly.（ご要望を検討し、それに応じて回答いたします。）この使い方はビジネスメールで非常によく使われる定番フレーズです。therefore、より硬い文脈なら thus、規則や状況に従うなら accordingly です。日本語の「したがって」は非常に汎用性が高いですが、英語では「なぜ『したがって』なのか（論理なのか、方法なのか、対応なのか）」を意識して選ぶ必要があります。Punctuation Patterns for Formal Connectors
| Structure Type | Pattern | Example |
|---|---|---|
|
Between Clauses
|
Clause 1; [Word], Clause 2
|
The tax increased; hence, prices rose.
|
|
Sentence Starter
|
[Word], Clause 1
|
Thus, the theory was proven.
|
|
Mid-Clause
|
Subject, [Word], Verb
|
The manager, accordingly, resigned.
|
|
Noun Phrase (Hence only)
|
Clause 1, hence [Noun]
|
He was late, hence the anger.
|
|
Participle (Thus only)
|
Clause 1, thus [Verb-ing]
|
He ran, thus winning the race.
|
Meanings
These are conjunctive adverbs used to indicate that the following statement is a logical consequence, result, or manner derived from the preceding information.
Logical Consequence (Hence)
Used to suggest that the second fact follows naturally or logically from the first.
“The company is downsizing; hence, many employees are worried.”
“The roads were icy, hence the many accidents reported this morning.”
Manner or Result (Thus)
Used to mean 'in this way' or 'as a result of what has just been mentioned'.
“The experiment was conducted under strict conditions, thus ensuring accuracy.”
“Thus, we can conclude that the hypothesis was correct.”
Corresponding Action (Accordingly)
Used to show that an action was performed in a way that is appropriate to the preceding circumstances.
“We have received your request and will act accordingly.”
“The budget was limited; accordingly, we chose the most cost-effective option.”
Reference Table
| 用語 | 機能 | 句読点 | 使用文脈 | 例文 |
|---|---|---|---|---|
|
Hence
|
直接的な論理的結果／推論
|
; hence, / . Hence,
|
学術、公式報告書、法律
|
The data was corrupted; hence, the experiment yielded unreliable results.
|
|
Thus
|
直接的な論理的結論／結果
|
; thus, / . Thus,
|
学術、科学論文、公式プレゼンテーション
|
Sales plummeted last quarter. Thus, we need to revise our marketing strategy.
|
|
Accordingly
|
状況に応じた適切な行動／対応
|
; accordingly, / . Accordingly,
|
ビジネス、法律、政策文書
|
The project deadline was moved up. Accordingly, we ramped up production.
|
|
Therefore
|
一般的な結果／理由（hence/thusよりやや非公式）
|
; therefore, / . Therefore,
|
公式文書、説得力のある議論
|
The budget was approved. Therefore, funds were allocated.
|
フォーマル度スペクトル
The price is prohibitive; hence, I shall decline the purchase. (Shopping/Negotiation)
The price is too high; therefore, I'm not buying it. (Shopping/Negotiation)
It's too expensive, so I'm not getting it. (Shopping/Negotiation)
Too pricey, I'm gonna pass. (Shopping/Negotiation)
フォーマルな接続詞：Hence, Thus, Accordingly
Hence
- 直接的な結果 前の文から導かれる結果を示す。
- 推論 論理的な推論を導入するために使用される。
- 学術論文 研究論文、エッセイで一般的。
Thus
- 論理的結論 議論の最終的な推論を提示する。
- 行動の結果 出来事に続く明確な結果を示す。
- 科学報告書 発見を述べるためによく使われる。
Accordingly
- 適切な行動 状況に合った行動を説明する。
- 〜に応じて 以前の情報に合致する反応を強調する。
- ビジネス文脈 方針、法律、業務文書で見られる。
フォーマルな接続詞対決
フォーマルな結果接続詞の選び方
直接的で論理的な結果や推論を示したいですか？
次の文は、前の文に対する適切な行動や対応ですか？
文脈はフォーマルですか（学術、ビジネス、専門的）？
フォーマルな接続詞のシナリオ
学術・科学
- • 研究データからの結論を導き出す
- • 仮説と発見を結びつける
- • エッセイで論理的な議論を提示する
- • 科学論文の方法論
ビジネス・専門職
- • 戦略的決定を正当化する
- • 報告書で次のステップを概説する
- • 顧客の要求に正式に対応する
- • 内部方針の変更を設定する
法律・公式
- • 法的判例とその結果を述べる
- • 公式書簡
- • 公式宣言と布告
- • 手続きの説明
レベル別の例文
It is cold, so I wear a coat.
It is cold, hence I wear a coat (Formal).
He is tired, so he sleeps.
He is tired, thus he sleeps (Formal).
The teacher said 'sit', so I sat.
The teacher said 'sit', and I acted accordingly (Formal).
I have no money, so I cannot buy it.
I have no money, hence I cannot buy it (Formal).
The shop was closed; hence, I went home.
The shop was closed; so, I went home.
He did not study; thus, he failed.
He did not study; as a result, he failed.
The rules are clear; please act accordingly.
The rules are clear; please follow them.
It was late, hence the dark sky.
It was late, that is why the sky was dark.
The company lost money; hence, they fired staff.
The company lost money; therefore, they fired staff.
She practiced every day, thus becoming a pro.
She practiced every day, and in that way became a pro.
We found a mistake and fixed it accordingly.
We found a mistake and fixed it in the right way.
The flight was canceled; accordingly, we booked a hotel.
The flight was canceled; consequently, we booked a hotel.
The evidence was insufficient; hence, the suspect was released.
The evidence was not enough; as a result, the suspect was released.
The city was built on a swamp, thus explaining the humidity.
The city was built on a swamp, which explains the humidity.
The terms of the contract have changed; please update your records accordingly.
The contract terms changed; please update your records to match.
He was the eldest son, hence the heir to the throne.
He was the oldest son, and for that reason, the heir.
The hypothesis was flawed from the outset; hence, the entire study must be discarded.
The hypothesis was wrong from the start; therefore, the study is useless.
The artist used vibrant colors, thus creating a sense of urgency in the viewer.
The artist used bright colors, and in doing so, created urgency.
The committee recognized the potential risks and adjusted the safety protocols accordingly.
The committee saw the risks and changed the rules to fit the situation.
The currency was devalued, hence the sudden spike in inflation.
The money lost value, which caused the sudden inflation.
The philosophical framework is inherently dualistic; hence, any attempt at monism is futile.
The philosophy is dualistic; therefore, monism won't work.
The protagonist fails to recognize his own hubris, thus precipitating his tragic downfall.
The hero doesn't see his pride, which causes his tragedy.
The geopolitical landscape has shifted; our foreign policy must be recalibrated accordingly.
The world has changed; we must change our policy to match.
The manuscript was discovered centuries hence, providing a window into a lost civilization.
The book was found centuries later, showing us a lost world.
間違えやすい
Learners use them interchangeably, but 'hence' is more about the source/origin.
Register mismatch.
よくある間違い
I am hot hence I drink water.
I am hot, so I drink water.
The car is old, thus it is slow.
The car is old; thus, it is slow.
He was late, hence he missed the meeting.
He was late; hence, he missed the meeting.
The results were poor; accordingly, we can conclude the theory is wrong.
The results were poor; hence, we can conclude the theory is wrong.
He spoke thusly to the crowd.
He spoke thus to the crowd.
文型パターン
The ___ was ___; hence, the ___.
We have updated the ___; please ___ accordingly.
Real World Usage
The data was skewed; hence, the conclusion is unreliable.
The defendant acted in self-defense; accordingly, the charges are dropped.
The meeting has been moved to 3 PM. Please plan accordingly.
The solution was heated, thus accelerating the reaction.
The bridge is closed; hence, traffic is backed up for miles.
He was a man of great pride, hence his refusal to ask for help.
句読点に注意！
非公式な場面では避ける！
HenceとAccordinglyの使い分け！
学術界の強力なツール！
接続詞を使い分けよう！
Smart Tips
Replace 'so' with 'accordingly' at the end of a sentence.
Use 'Thus' followed by a comma to summarize your findings.
Use 'hence' + [Noun Phrase].
Check if the next word is a verb ending in -ing. If not, you probably need a semicolon.
発音
Hence/Thus Stress
Both words are usually stressed to emphasize the logical link.
Accordingly Intonation
Often has a falling intonation when placed at the end of a sentence.
Logical Emphasis
The results were poor [PAUSE] HENCE [PAUSE] the change.
Emphasizing the cause-effect relationship.
暗記しよう
記憶術
H.T.A. - High-Tone Accuracy. Use Hence, Thus, and Accordingly to keep your tone high and accurate.
視覚的連想
Imagine a judge in a courtroom. When they make a decision, they use 'Hence' to point to evidence, 'Thus' to explain the law, and 'Accordingly' to give the sentence.
Rhyme
When the logic is clear and the register high, use Hence and Thus to catch the eye.
Story
A scientist found a new planet (Fact). Hence, she named it (Source). Thus, she became famous (Manner). She was invited to a gala and dressed accordingly (Response).
Word Web
チャレンジ
Write three sentences about your last work project using one of each: hence, thus, and accordingly.
文化メモ
Very high frequency of 'hence' in academic papers to maintain a detached, objective tone.
Frequent use of 'accordingly' in judicial opinions to show how a ruling follows from a law.
Using 'thus' in presentations to sound authoritative and data-driven.
'Hence' comes from Old English 'henan' (from here). 'Thus' comes from Old English 'thus' (in this way).
会話のきっかけ
The weather forecast predicts a storm; how should we plan our event accordingly?
If a company's profits drop, they might cut costs. Hence, what happens to the employees?
日記のテーマ
よくある間違い
Test Yourself
The report highlighted a critical security flaw; ___, immediate action was required.
Thusは、フォーマルな文脈で直接的な論理的結果を導入するのに適切です。Soはカジュアルすぎ、becauseは原因を導入するもので結果ではありません。Find and fix the mistake:
The evidence was compelling hence the jury returned a guilty verdict.
henceの前にセミコロン、後にカンマが必要です。正しい文を選びましょう。
accordinglyが最も適しています。henceやthusは、より直接的な論理的推論を示唆します。Score: /3
練習問題
8 exercisesThe project deadline has been moved up; ________, we need to increase our daily output.
Find and fix the mistake:
The software crashed, thus we lost all the unsaved data.
The instructions were clear, and he acted ________.
He is the CEO, so he has the final say.
Identify the odd one out.
1. Hence, 2. Thus, 3. Accordingly
'Thus' can be followed by a verb ending in -ing.
Manager: 'We are over budget.' Employee: 'I will adjust the spending ________.'
Score: /8
Practice Bank
12 exercisesThe new policy was widely adopted; ___, its implementation saw few issues.
The security breach was a major concern. ___, all sensitive accounts were temporarily locked.
The results were inconclusive, thus more research is needed.
I was busy. Hence, couldn't make it.
正しい文はどれですか？
正しい文を選びましょう。
Translate into English: 'Die Forschung zeigte neue Erkenntnisse; demnach wurden die Richtlinien überarbeitet.'
Translate into English: 'Es gab keinen Beweis; somit konnte keine Anklage erhoben werden.'
これらの単語を並べ替えて文を作りましょう。
これらの単語を並べ替えて文を作りましょう。
状況と最も適切なフォーマルな続きを組み合わせましょう。
文脈と最適な接続詞を組み合わせましょう。
Score: /12
よくある質問 (8)
Yes, but it must be followed by a comma and a full clause, or used as a sentence fragment in very formal writing (e.g., 'Hence the confusion.').
It is often used, but many grammarians consider it incorrect because 'thus' is already an adverb. Stick to `thus` in formal writing.
`Therefore` is for pure logic (A=B, B=C, therefore A=C). `Hence` often implies a source or a 'from this' relationship.
Absolutely. Using these correctly will significantly boost your 'Cohesion and Coherence' score.
Because these words are adverbs, not conjunctions. They aren't strong enough to hold two sentences together with just a comma.
No, it can also follow a semicolon: 'The rules changed; accordingly, we left.'
It is equally common in both, provided the context is formal academic or legal writing.
Yes, in the sense of 'from now'. For example, 'Two years hence' means 'Two years from now'.
Scaffolded Practice
1
2
3
4
Mastery Progress
Needs Practice
Improving
Strong
Mastered
In Other Languages
Por lo tanto / En consecuencia
English 'hence' has a specific 'source' nuance that 'por lo tanto' lacks.
Par conséquent / Ainsi
French punctuation rules for 'donc' are much more relaxed than English rules for 'thus'.
Daher / Demnach
German word order (V2) changes after these connectors, whereas English does not.
したがって (Shitagatte) / ゆえに (Yueni)
Japanese connectors often appear at the very start of the sentence more frequently than mid-clause.
وبناءً على ذلك (Wa bina'an 'ala dhalik)
Arabic often uses long phrasal connectors where English uses a single word like 'hence'.
因此 (Yīncǐ) / 从而 (Cóng'ér)
Chinese does not use semicolons in the same way to separate these logical clauses.
Learning Path
Prerequisites
関連動画
08:55 The Land Your State Doesn't Control
09:01 I Vacuum Venom from the World's Deadliest Spider
07:46 You Are Not Where You Think You Are
【英語の接続詞】Therefore, Thus, Hence, Accordingly, Consequently の違いを徹底解説！
Atsueigo
【英語】「したがって」の英語表現！Therefore / Thus / Hence / Accordingly / Consequently
Hapa Eikaiwa
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