Grammar Rule in 30 Seconds
When starting with 'Under no circumstances', you must swap the subject and the auxiliary verb to create a formal, powerful prohibition.
- Start with the phrase: 'Under no circumstances...' (e.g., Under no circumstances should...)
- Invert the subject and auxiliary: Use question-style word order (e.g., ...will he leave instead of ...he will leave)
- Never use a second 'not': The phrase itself is already negative (e.g., Under no circumstances should you go)
Overview
Under no circumstances を文頭に置く倒置構造は、単なる否定を超えた「強い禁止」や「絶対的な否定」を表現するための極めて洗練された手法です。Under no circumstances は、まさにその後者のような、重みと権威のある響きを持っています。Under no circumstances（いかなる状況下でも〜ない）のような強い否定の意味を持つ言葉が文頭に来ると、その直後の「主語」と「助動詞（またはbe動詞）」の順番がひっくり返ります。Under no circumstances should you press this button. と、文の冒頭から中盤にかけて、すでに「強い禁止」のエネルギーが放出されます。このスピード感と強制力が、この構文の最大の特徴です。Under no circumstances を使った倒置文を作るには、以下の「黄金律」に従う必要があります。このパターンは、疑問文を作る時のルールと全く同じです。- 助動詞（Modal Verbs）がある場合
should, must, can, will などがある場合、それを主語の前に出します。You should open this door.→Under no circumstances should you open this door.
- be動詞の場合
The data is to be shared.→Under no circumstances is the data to be shared.
- 完了形（Have + 過去分詞）の場合
have/has/had を主語の前に出します。He has lied to us.→Under no circumstances has he lied to us.(※文脈により強調)
- 一般動詞の場合（注意！）
work, accept, go など）の場合、疑問文と同様に do, does, did を呼び出す必要があります。They accept cash.→Under no circumstances do they accept cash.She signed the contract.→Under no circumstances did she sign the contract.
They agree. | ... do they agree. |He agrees. | ... does he agree. |They agreed. | ... did they agree. |You are leaving. | ... are you leaving. |You can enter. | ... can you enter. |Under no circumstances are employees permitted to accept gifts from clients.
Under no circumstances will the company be liable for any indirect damages.
Under no circumstances should the emergency exit be blocked.
Under no circumstances must this chemical be mixed with water.
Under no circumstances will I negotiate with terrorists.
Under no circumstances did I authorize that transaction.
Under no circumstances を文頭に置いただけで満足してしまい、後ろの語順を普通の SVO のままにしてしまうケースです。- 誤:
*Under no circumstances you should tell him.* - 正:
Under no circumstances should you tell him. - 原因: 日本語では「どんなことがあっても(Under no circumstances)、あなたは(you)彼に言うべきではない(should tell him)」と、語順を変えずに単語を並べるだけで意味が通じるため、英語の「構造的変化」を忘れてしまうのです。
do/does/did の欠落- 誤:
*Under no circumstances they accept credit cards.* - 正:
Under no circumstances do they accept credit cards. - 原因: 日本語の動詞は活用（〜する、〜した）で時制を示しますが、英語の倒置では「疑問文の形を作る」というステップが必要です。このステップは日本語に存在しないため、意識から抜け落ちやすいのです。
Under no circumstances 自体に no が含まれているため、後ろの節を否定文にしてしまうミスです。- 誤:
*Under no circumstances don't you enter the room.* - 正:
Under no circumstances do you enter the room. - 原因: 「いかなる場合も〜ない」という日本語の訳に引きずられ、後ろにも
notを入れたくなってしまう心理的バイアスです。英語ではUnder no circumstancesがすでに否定の役割を完結させていることを忘れないでください。
- 不自然:
*Under no circumstances will I eat this apple because I'm full.* - 解説: お腹がいっぱいだからリンゴを食べない、という日常的な内容にこの構文を使うと、まるで国家機密を守るかのような大げさな響きになり、相手を困惑させます。
Under no circumstances 以外にも、倒置を引き起こす否定語句はいくつかあります。それぞれのニュアンスの違いを理解しましょう。Under no circumstances should you leave. |Under no circumstances とほぼ同義だが、ややイギリス英語寄り。 | On no account must this door be opened. |At no time did he mention his resignation. |Never have I seen such a beautiful sunset. |Rarely does she attend social events. |Under no circumstances vs In no wayUnder no circumstancesは「条件（いかなる状況でも）」に焦点を当て、主に禁止を表します。In no wayは「方法・程度（決して〜ではない）」に焦点を当て、主に事実の否定を表します。In no way am I responsible for his mistake.(私の責任では全くない。)
Under no circumstances を文末に置くことはできますか？その場合も倒置しますか？- 文末（普通）:
You should leave the building under no circumstances. - 文頭（強調）:
Under no circumstances should you leave the building.
Not under any circumstances とはどう違いますか？Under no circumstances の方が圧倒的に一般的です。Not under any circumstances を文頭に置いて倒置させることも可能ですが（例: Not under any circumstances will I agree.）、やや不自然に聞こえることが多いため、Under no circumstances を優先して使いましょう。Inversion Patterns by Verb Type
| Verb Type | Auxiliary/Modal | Subject | Main Verb | Example |
|---|---|---|---|---|
|
Modal
|
should
|
you
|
tell
|
Under no circumstances should you tell...
|
|
Present Simple
|
does
|
he
|
sign
|
Under no circumstances does he sign...
|
|
Past Simple
|
did
|
they
|
know
|
Under no circumstances did they know...
|
|
Present Continuous
|
are
|
we
|
leaving
|
Under no circumstances are we leaving...
|
|
Present Perfect
|
has
|
she
|
lied
|
Under no circumstances has she lied...
|
|
Passive Voice
|
is
|
it
|
permitted
|
Under no circumstances is it permitted...
|
|
Future (will)
|
will
|
I
|
agree
|
Under no circumstances will I agree...
|
Meanings
A formal grammatical structure used to emphasize that an action is strictly forbidden or will never happen, regardless of the situation.
Absolute Prohibition
Used to issue a command that has no exceptions, often in legal or safety contexts.
“Under no circumstances are visitors allowed to enter the laboratory without supervision.”
“Under no circumstances may the seal be broken before the trial begins.”
Rhetorical Emphasis
Used in persuasive speaking or writing to show strong personal resolve or a firm stance.
“Under no circumstances am I going to let them win this argument.”
“Under no circumstances did she intend to offend her colleagues.”
Contractual/Legal Clauses
Found in terms of service or contracts to define limits of liability or behavior.
“Under no circumstances shall the tenant sublet the property.”
“Under no circumstances does this warranty cover water damage.”
Reference Table
| 構造 | 通常の文 | 倒置された文 | 与える印象 |
|---|---|---|---|
|
Standard (標準)
|
You are permitted to leave.
|
"You are permitted"
|
中立的、事実の伝達
|
|
Inversion (倒置)
|
Under no circumstances are you permitted to leave.
|
"are you permitted"
|
強い禁止、公式な警告
|
|
Standard (標準)
|
They can share the secret.
|
"They can share"
|
許可や能力の提示
|
|
Inversion (倒置)
|
Under no circumstances can they share the secret.
|
"can they share"
|
絶対的な許可の否定
|
|
Standard (標準)
|
You should neglect safety.
|
"You should neglect"
|
（否定文で）助言
|
|
Inversion (倒置)
|
Under no circumstances should you neglect safety.
|
"should you neglect"
|
厳重な警告、強い忠告
|
|
Standard (標準)
|
The company will compromise data.
|
"The company will compromise"
|
未来の予測
|
|
Inversion (倒置)
|
Under no circumstances will the company compromise data.
|
"will the company compromise"
|
将来にわたる絶対的な保証
|
フォーマル度スペクトル
Under no circumstances are you to enter this room. (Security boundary)
You aren't allowed in this room under any circumstances. (Security boundary)
You can't come in here, no matter what. (Security boundary)
No way you're gettin' in here. (Security boundary)
「Under no circumstances」の倒置マスターマップ
必須要素
- 否定の副詞句 Under no circumstances
- 助動詞 do, are, will, should, have, could
- 主語 you, employees, data
- 本動詞 leave, divulge, be, tolerate
使用シーン
- 公式な警告 Safety notices, policy documents
- 厳格な規則 Terms & Conditions, university rules
- ドラマチックな強調 Strong refusal, literary effect
標準文 vs 倒置文の比較
倒置文作成のステップ
絶対的な禁止や公式な警告を伝えたいですか？
元の文に助動詞（is, are, will, can等）がありますか？
この構文を使うべき時・避けるべき時
使うべき場面
- • 大学のポリシー
- • 法的文書
- • 職場の安全規定
- • 公式声明
避けるべき場面
- • 友達へのLINE
- • 日常の雑談
- • SNSの軽い投稿
- • カジュアルな相談
レベル別の例文
Under no circumstances can you go.
Under no circumstances can you go.
Under no circumstances is he here.
Under no circumstances is he here.
Under no circumstances will I help.
Under no circumstances will I help.
Under no circumstances are we late.
Under no circumstances are we late.
Under no circumstances do you touch that.
Under no circumstances do you touch that.
Under no circumstances does she eat meat.
Under no circumstances does she eat meat.
Under no circumstances did they see the movie.
Under no circumstances did they see the movie.
Under no circumstances can we open the window.
Under no circumstances can we open the window.
Under no circumstances should you give them your key.
Under no circumstances should you give them your key.
Under no circumstances will the bank accept a copy.
Under no circumstances will the bank accept a copy.
Under no circumstances are students allowed to smoke.
Under no circumstances are students allowed to smoke.
Under no circumstances did I agree to those terms.
Under no circumstances did I agree to those terms.
Under no circumstances may the data be shared with third parties.
Under no circumstances may the data be shared with third parties.
Under no circumstances would he have betrayed his country.
Under no circumstances would he have betrayed his country.
Under no circumstances does the warranty cover accidental damage.
Under no circumstances does the warranty cover accidental damage.
Under no circumstances are you to leave your post.
Under no circumstances are you to leave your post.
Under no circumstances shall the landlord be responsible for theft.
Under no circumstances shall the landlord be responsible for theft.
Under no circumstances were the researchers to disclose the results.
Under no circumstances were the researchers to disclose the results.
Under no circumstances has the board ever considered a merger.
Under no circumstances has the board ever considered a merger.
Under no circumstances could such a tragedy have been avoided.
Under no circumstances could such a tragedy have been avoided.
Under no circumstances is the veracity of his testimony to be questioned.
Under no circumstances is the veracity of his testimony to be questioned.
Under no circumstances had the protagonist anticipated such a betrayal.
Under no circumstances had the protagonist anticipated such a betrayal.
Under no circumstances are these ancient rituals to be performed by outsiders.
Under no circumstances are these ancient rituals to be performed by outsiders.
Under no circumstances will the government yield to the demands of terrorists.
Under no circumstances will the government yield to the demands of terrorists.
間違えやすい
Both use inversion, but 'Not only' is additive, while 'Under no circumstances' is prohibitive.
Learners often invert the first clause with 'Only when', but the inversion actually happens in the second clause.
Learners try to add 'not' because the sentence feels like it needs more negation.
よくある間違い
Under no circumstances you can go.
Under no circumstances can you go.
Under no circumstances you should not smoke.
Under no circumstances should you smoke.
Under no circumstances he is happy.
Under no circumstances is he happy.
Under no circumstances I will help.
Under no circumstances will I help.
Under no circumstances he likes pizza.
Under no circumstances does he like pizza.
Under no circumstances they went there.
Under no circumstances did they go there.
Under no circumstances we are leaving.
Under no circumstances are we leaving.
Under no circumstances you have finished.
Under no circumstances have you finished.
Under no circumstances should you not tell him.
Under no circumstances should you tell him.
Under no circumstances he can be trusted.
Under no circumstances can he be trusted.
Under no circumstances the law applies to them.
Under no circumstances does the law apply to them.
文型パターン
Under no circumstances ___ ___ (subject) ___ (verb).
Under no circumstances ___ (do/does/did) ___ (subject) ___ (verb).
Under no circumstances ___ (be) ___ (subject) ___ (adjective/passive).
Under no circumstances ___ (have/has) ___ (subject) ___ (past participle).
Real World Usage
Under no circumstances are bags to be left unattended.
Under no circumstances shall the deposit be returned.
Under no circumstances would I lie to a client.
Under no circumstances am I ever dating a Leo again!
Under no circumstances are you to go out after midnight.
Under no circumstances does the developer guarantee 100% uptime.
「疑問文の語順」をイメージして！
Under no circumstances are you allowed to enter.
使いすぎには要注意！
Under no circumstances should you forget your keys.
助動詞がない時は 'do/does/did' を補う
Under no circumstances do we tolerate bullying.
フォーマル度のシグナル
Under no circumstances will the company compromise data.
「ポリシー」を書き換えて練習
Under no circumstances are employees to share passwords.
Smart Tips
Use 'Under no circumstances' instead of 'Don't.' It makes your boundary sound like a law rather than a request.
Immediately prepare your brain for a question-style word order. Don't let the subject come first!
Remember that 'did' takes the base form of the verb. Don't use the past tense verb twice!
Use 'shall' with 'Under no circumstances' to sound legally binding.
発音
Stress on 'No'
To emphasize the prohibition, the word 'no' is usually stressed and slightly elongated.
Falling Intonation
The sentence usually ends with a strong falling intonation to show finality and authority.
The Emphatic Peak
Under NO circumstances ↘ should you go.
The peak on 'NO' highlights the absolute nature of the rule.
暗記しよう
記憶術
UNC-ASV: Under No Circumstances - Auxiliary, Subject, Verb.
視覚的連想
Imagine a giant red 'X' over a door. On the door handle, there is a tag that says 'Under no circumstances.' To open the door (the sentence), you must turn the handle (swap the subject and verb).
Rhyme
When 'Under no circumstances' starts the line, swap the subject and verb to make it shine!
Story
A strict judge sits in a courtroom. He bangs his gavel and shouts, 'Under no circumstances!' Every time he says this, the lawyers in the room have to stand on their heads (inversion) to show they are listening to his formal command.
Word Web
チャレンジ
Write three things you would never do at work using this structure (e.g., 'Under no circumstances would I...').
文化メモ
In the UK, 'Under no circumstances' is frequently paired with 'shall' in legal documents to denote a binding obligation.
In US corporate culture, this phrase is used in 'Zero Tolerance' policies to indicate that an action will result in immediate termination.
Scholars use this to dismiss a theory or possibility with absolute certainty, showing high confidence in their research.
The phrase combines the Old English 'under' (meaning 'among' or 'before') with the Latin-derived 'circumstances' (circum - around, stare - to stand).
会話のきっかけ
Under no circumstances would I ever eat...
Under no circumstances should a friend...
Under no circumstances will I tolerate...
Under no circumstances did I think that...
日記のテーマ
よくある間違い
Test Yourself
Under no circumstances ___ staff leave the premises unattended.
正しい文を選んでください：
Find and fix the mistake:
Under no circumstances he should interrupt the speaker.
Arrange the words in the correct order:
All words placed
Click words above to build the sentence
Score: /4
練習問題
8 exercisesUnder no circumstances _______ (we / can) accept late applications.
Find and fix the mistake:
Under no circumstances he did tell the truth.
You should not press the red button.
Select the formal prohibition.
Under no circumstances are you not to leave.
circumstances / under / no / I / would / that / do
Manager: 'Can we share these files with the client?' Security: 'No, _______.'
Identify the verb that needs 'do/does/did'.
Score: /8
Practice Bank
11 exercisesUnder no circumstances ___ visitors bring outside food or drinks.
Under no circumstances he is permitted to leave the building early.
文法的に正しい文はどれですか？
「いかなる状況でも、有効な許可証なしに外出することは許可されません」を英語に訳してください。
単語を並べ替えてください：
文の始まりと、正しい倒置の終わりを組み合わせてください：
Under no circumstances ___ the terms of the agreement be altered.
Under no circumstances passengers must exit the vehicle while it is moving.
正しい文を選んでください：
「いかなる状況でも、彼らが真実を知り得たはずはありません」を英語に訳してください。
単語を並べ替えてください：
Score: /11
よくある質問 (8)
Yes, but only if you keep the 'not' with the verb. 'You should not go under any circumstances.' If you start with 'Under no circumstances,' you must invert.
Mostly, yes. It is very formal. However, you might hear it in a very serious speech or a heated argument where someone wants to sound authoritative.
It's a rhetorical device called 'Negative Inversion.' It draws the listener's attention to the negative condition immediately.
Actually, 'should' or 'may' are more common. 'Under no circumstances must you...' is grammatically possible but sounds slightly redundant because 'must' is already so strong.
The inversion still happens with the first auxiliary. 'Under no circumstances will John and Mary be invited.'
Usually, no. In negative inversion, we don't put a comma between the adverbial phrase and the auxiliary verb.
Yes! 'Under no condition' and 'On no account' follow the exact same inversion rules.
Yes, frequently. It is a high-level structure that examiners look for to award C1 or C2 marks in the writing and speaking sections.
Scaffolded Practice
1
2
3
4
Mastery Progress
Needs Practice
Improving
Strong
Mastered
In Other Languages
Unter keinen Umständen
German doesn't need 'do-support' like English does.
Bajo ninguna circunstancia
English requires inversion; Spanish does not.
En aucun cas
French uses 'ne...pas' structures rather than subject-auxiliary inversion.
いかなる状況下でも (Ikanaru joukyouka demo)
Japanese is SOV and uses particles, so word order 'swapping' doesn't exist in this way.
تحت أي ظرف من الظروف (Tahta ayyi zarfin...)
Arabic doesn't have an 'auxiliary swap' equivalent to English inversion.
在任何情况下都不 (Zài rènhé qíngkuàng xià dōu bù)
Chinese relies on the particle 'dōu' to emphasize the 'no circumstances' part.
Learning Path
Prerequisites
Learn These First
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