Grammar Rule in 30 Seconds
Use 'were' instead of 'was' for all subjects in hypothetical 'if' clauses to signal that a situation is purely imaginary.
- Use 'were' for I/He/She/It in 'if' clauses: 'If I were you...'
- It expresses situations contrary to current reality: 'If she were here now...'
- In formal English, use inversion for emphasis: 'Were I to go...'
Overview
He is here）」という事実を述べるのに対し、仮定法は「（実際にはいないけれど）もし彼がここにいたら」という、現実から一歩離れた「非現実」や「反事実」の世界を指し示します。- 1時間的な距離: 「今」から離れた「過去」のこと。
- 2心理的な距離: 「現実」から離れた「想像・仮定」のこと。
be 動詞の扱いです。標準的な英語のルール（直説法）では I was や He was となりますが、仮定法では主語が何であれ were を使うのが伝統的かつ正式なルールです。例えば、If I were you...（もし私があなたなら）という表現です。I なのに were を使うというこの「文法的な違和感」こそが、これが100%想像の話であることを強調する強力なマーカーになります。- 1If-clause（条件節）: 「もし〜だとしたら」という想像の前提。ここでは動詞の過去形（
be動詞ならwere）を使います。 - 2Main clause（帰結節）: 「（その想像の世界では）〜だろうに」という結果。ここでは
would,could,mightといった助動詞の過去形 ＋ 動詞の原形を使います。
If + 主語 + 動詞の過去形（be動詞はwere） , 主語 + would / could / might + 動詞の原形be 動詞の場合、すべての主語に対して were を使うのが C1 レベルでのスタンダードです。I | were | If I were the CEO... | 私がCEOなら（実際は違う） |You | were | If you were in Tokyo... | あなたが東京にいたら（実際はいない） |He/She/It | were | If it were sunny... | 晴れていたら（実際は雨など） |We/They | were | If they were here... | 彼らがここにいたら（実際はいない） |If I had enough money...（もし十分なお金を持っていたら ※今は持っていない）If she knew the truth...（もし彼女が真実を知っていたら ※今は知らない）
would: 「〜だろう」という強い推測や意志。最も一般的。could: 「〜できるだろう」という能力や可能性。might: 「〜かもしれない」という控えめな推測。
If 節を後ろに持ってくることも可能です。その場合、コンマは不要です。I would buy that house if I were rich.
If I were to...were to + 動詞の原形 を使います。If the company were to go bankrupt, what would happen?（万が一その会社が倒産するとしたら、どうなるだろうか？）
- 現在の事実に反する仮定 (Contrary to Fact):
If I lived in London, I would visit the British Museum every weekend.
- 控えめで丁寧なアドバイス (Polite Advice):
You should... と言うよりも、仮定法を使うことで「私という別の人間だったら」というクッションを置き、相手への圧迫感を減らします。If I were you, I would double-check the contract before signing.
- 願望や後悔のニュアンスを含む表現 (Wishes and Regrets):
If we had more resources, we could finish this project sooner.
- 思考実験や仮説の提示 (Thought Experiments):
If we increased the price by 10%, how many customers would we lose?
- 非現実的な夢や空想 (Imaginary Scenarios):
If I won the lottery, I would travel around the world in a private jet.
was と were の混同If I was... と言うネイティブも多いですが、C1レベルのライティングやフォーマルなスピーチでは、必ず were を使うべきです。- 間違い:
If he was more careful, he wouldn't make these mistakes. - 正解:
If he were more careful, he wouldn't make these mistakes. - なぜ間違えるか: 日本語には主語による動詞の変化がないため、英語の「主語と動詞の一致（Subject-verb agreement）」を意識しすぎると、三人称単数の
heにつられてwasを選んでしまいがちです。しかし、仮定法は「あえて一致を崩す」ことで非現実を示していることを忘れないでください。
- 直説法 (Real):
If it rains tomorrow, I will stay home.（雨が降る可能性が十分ある） - 仮定法 (Unreal):
If it rained diamonds, I would be rich.（ダイヤモンドが降ることはまずない） - 間違い:
If I have more time, I would learn French. - 修正:
If I had more time, I would learn French.（「あればいいのにな」というニュアンスなら、hadとwouldをセットにする必要があります）
will を使ってしまうIf I had...）を使っているのに、結果のパートで will を使ってしまうミスです。- 間違い:
If I were the president, I will change the law. - 正解:
If I were the president, I would change the law. - なぜ間違えるか: 日本語の「〜するつもりだ（意志）」をそのまま
willと訳してしまうためです。しかし、想像の世界の話（過去形）を始めたら、その結末も想像の助動詞（would等）で閉じなければなりません。これを「時制の呼応」と呼びます。
Present / will + 原形 | If it rains, I will go. |Past (were) / would + 原形 | If it rained, I would go. |had + 過去分詞 / would have + 過去分詞 | If it had rained, I would have gone. |First Conditionalは「もし〜なら（実際にありそう）」Second Conditionalは「もし〜だとしたら（実際は違う）」
If I get the job, I will move to Tokyo.（内定の可能性を感じている：直説法）If I got the job, I would move to Tokyo.（まだ応募もしていない、あるいは自信がない：仮定法）
If I was... は絶対に間違いですか？If I were... を使うのが賢明です。were を使うことで「私は文法の洗練されたルールを理解している」という教養を示すことができます。would の代わりに should を使うことはありますか？I, we）の時に should を使うことがありますが、現代英語では稀です。基本的には would（意志・推測）、could（能力）、might（可能性）の3つをマスターすれば十分です。If を省略できると聞いたのですが？were を使う場合、If を省略して倒置（Inversion）させることができます。これは非常にフォーマルで文学的な響きになります。If I were more experienced...→Were I more experienced...
If の最大の違いは何ですか？If I were... と口にするたびに、あなたは現実とは別の可能性を探求していることになります。この洗練された道具を使いこなし、より深みのあるコミュニケーションを楽しんでください。頑張りましょう（Keep up the great effort）！2. Negative Contractions
| Full Form | Contraction | Usage |
|---|---|---|
|
If I were not
|
If I weren't
|
Common / Neutral
|
|
If she were not
|
If she weren't
|
Common / Neutral
|
|
Were I not
|
N/A
|
Formal (No contraction)
|
The Subjunctive 'To Be' (Irrealis)
| Subject | Subjunctive Form | Example Clause | Meaning |
|---|---|---|---|
|
I
|
were
|
If I were you...
|
Imaginary identity
|
|
You
|
were
|
If you were here...
|
Imaginary presence
|
|
He / She / It
|
were
|
If it were true...
|
Imaginary fact
|
|
We
|
were
|
If we were rich...
|
Imaginary status
|
|
They
|
were
|
If they were fast...
|
Imaginary ability
|
Meanings
A specific verb form used to express hypothetical, imaginary, or counterfactual situations that are not true in the present.
Hypothetical Identity
Imagining being someone else or in someone else's position.
“If I were you, I'd take the job.”
“If he were the manager, things would be different.”
Counterfactual Present
Describing a present state that is the opposite of reality.
“If it were Sunday, I would still be in bed.”
“If the weather were better, we'd go for a walk.”
Formal Inversion
A literary way to express a hypothesis by removing 'if' and starting with 'were'.
“Were I to tell you the truth, you wouldn't believe me.”
“Were he more diligent, he would have finished by now.”
Reference Table
| 状況 | 直説法（事実） | 仮定法（非現実） |
|---|---|---|
|
I am tall
|
I am tall.
|
If I were tall...
|
|
He has time
|
He has time.
|
If he had time...
|
|
She is here
|
She is here.
|
If she were here...
|
|
It is easy
|
It is easy.
|
If it were easy...
|
|
We live closer
|
We live closer.
|
If we lived closer...
|
|
They understand
|
They understand.
|
If they understood...
|
|
You are busy
|
You are busy.
|
If you were busy...
|
フォーマル度スペクトル
Were I in your position, I would submit the application immediately. (Career advice)
If I were you, I'd apply for the job. (Career advice)
If I was you, I'd just go for it. (Career advice)
Yo, if I'm you, I'm hitting 'send' right now. (Career advice)
仮定法：もしもの世界（If I were...）
目的
- Hypothetical 非現実の現在/未来
- Contrary to Fact 事実とは異なる
- Polite Advice If I were you... (丁寧なアドバイス)
- Wishes If only... (願望)
形成
- If Clause If + 主語 + 単純過去形
- Verb 'To Be' 常に 'were'
- Main Clause 主語 + would/could/might + 動詞の原形
よくある間違い
- 'was' vs 'were' 全ての主語で 'were' を使う
- Mixing Conditionals 第一条件文や第三条件文と混ぜない
仮定法と直説法の比較
「If I Were...」の使い分けフローチャート
今現実ではない状況、または非常に起こりにくい状況について話していますか？
「if」節の動詞は「to be」ですか？
仮定の結果は何ですか？
もしもの世界の仮定法の使い方
仮定
- • 非現実の現在の条件
- • 起こりにくい未来の出来事
- • もし〜だったら？のシナリオ
アドバイス
- • 丁寧な提案
- • If I were you...
願望・後悔
- • If only...
- • 現在と異なる願望
フォーマルな使用
- • 倒置形条件文 (Were I...)
- • 丁寧な問い合わせ
レベル別の例文
If I am hungry, I eat.
If I am hungry, I eat.
If it is sunny, we go out.
If it is sunny, we go out.
If you help me, I am happy.
If you help me, I am happy.
If I have money, I buy bread.
If I have money, I buy bread.
If I was rich, I would buy a house.
If I was rich, I would buy a house.
If I was you, I would go home.
If I was you, I would go home.
If she was here, she would help.
If she was here, she would help.
If it was my birthday, I would have a cake.
If it was my birthday, I would have a cake.
If I were you, I would talk to him.
If I were you, I would talk to him.
If he were taller, he could play basketball.
If he were taller, he could play basketball.
If the water were warmer, we could swim.
If the water were warmer, we could swim.
If I were a millionaire, I'd travel the world.
If I were a millionaire, I'd travel the world.
If I weren't so tired, I'd come to the party.
If I weren't so tired, I'd come to the party.
If she were to win, she would be shocked.
If she were to win, she would be shocked.
If it weren't for your help, I'd be lost.
If it weren't for your help, I'd be lost.
If I were in your shoes, I'd quit.
If I were in your shoes, I'd quit.
Were I to accept the offer, I would have to relocate.
Were I to accept the offer, I would have to relocate.
If it were not for the rain, the event would be a success.
If it were not for the rain, the event would be a success.
If he were half the man his father was, he'd admit it.
If he were half the man his father was, he'd admit it.
Were she more observant, she would have noticed the error.
Were she more observant, she would have noticed the error.
Were it not for his timely intervention, the project would have foundered.
Were it not for his timely intervention, the project would have foundered.
If I were but a younger man, I might take up the challenge.
If I were but a younger man, I might take up the challenge.
Should he fail, and were I to succeed, the balance would shift.
Should he fail, and were I to succeed, the balance would shift.
It is as though he were possessed by some strange spirit.
It is as though he were possessed by some strange spirit.
間違えやすい
Learners use 'was' for everything because it's simpler.
Thinking 'if' always triggers 'were'.
よくある間違い
If I am you, I go.
If I were you, I would go.
If I was rich, I will buy a car.
If I was rich, I would buy a car.
If I was you, I'd wait.
If I were you, I'd wait.
Were I was there, I would help.
Were I there, I would help.
文型パターン
If I were ___, I would ___.
If it weren't for ___, I wouldn't ___.
Were I to ___, I would ___.
Real World Usage
If I were hired, I would focus on increasing efficiency.
If I were you, I'd ask for a raise.
Wish I were back on the beach! 🏖️
Were the sample size larger, the results might differ.
If I were a boy, I think I could understand.
Were any party to breach this agreement...
非現実を見つけるヒント
was が来るべきところに were があったら、それは「現実じゃない話」のサインです。If I were rich, I would travel the world.
条件節は混ぜないで！
If it rains, I will take an umbrella.と
If it were sunny, I would go to the beach.は全く違う文法なので、注意しましょう。
フォーマルに決める倒置構文
Were I to manage this project, I would ensure success.と言うと、一気にプロフェッショナルな響きになりますよ。
丁寧なアドバイスのコツ
If I were you, I would talk to him.
可能性を示す「could/might」
would ですよね。でも、「買えるかもしれない」という可能性を示したい時はどうでしょう？そんな時は「could」や「might」を使って、あなたの気持ちをより正確に伝えられますよ。If I won the lottery, I could buy a house.(買える能力がある) や
If I won the lottery, I might buy a house.(買う可能性がある) のように使い分けましょう。
Smart Tips
Pause and change it to 'If I were you.' It's a small change that makes you sound much more professional.
Use inversion to sound more sophisticated.
Always follow them with 'were' to show the comparison is unreal.
Look for 'if' + 'was' and ask: 'Is this imaginary?' If yes, change to 'were'.
発音
Stress on 'Were'
In hypothetical sentences, 'were' is often slightly stressed to emphasize the unreality.
Hypothetical Rise-Fall
If I were ↑YOU, I'd ↓WAIT.
The rise on 'you' highlights the imaginary switch of identities.
暗記しよう
記憶術
W.E.R.E. = Wishes, Exaggerations, Recommendations, and Unreal Events.
視覚的連想
Imagine a 'Mirror World' where everything is the opposite. In this world, the verb 'was' is banned and replaced by a giant 'WERE' sign.
Rhyme
When the truth is far away, 'were' is what you have to say.
Story
A man named 'Was' only tells the truth about yesterday. His brother 'Were' is a dreamer who only talks about things that aren't real. When you dream, invite 'Were' to the party.
Word Web
チャレンジ
Write down 3 things you would do if you were a different gender, a different nationality, and a different species.
文化メモ
In the US, 'If I was' is becoming increasingly acceptable in all but the most formal writing.
The subjunctive 'were' is still strictly maintained in high-level British journalism (The Economist, BBC).
Verb patterns often follow different aspectual rules where the 'were' subjunctive may be omitted or replaced with 'be'.
Derived from the Old English 'wære', the singular past subjunctive form.
会話のきっかけ
If you were the leader of your country for one day, what is the first law you would change?
If you were able to travel back in time, which era would you visit?
Were you to lose your phone today, how would your life change?
日記のテーマ
よくある間違い
Test Yourself
If I ___ a bird, I would fly everywhere.
Find and fix the mistake:
If she was taller, she would reach the top shelf.
Choose the correct sentence:
Score: /3
練習問題
8 exercisesIf she ___ here, she would know what to do.
___ I to tell you the truth, you would be angry.
Find and fix the mistake:
If I were rich, I will buy a private jet.
If I were the boss, I would fire him.
In the subjunctive mood, we use 'were' for 'he', 'she', and 'it'.
A: I'm so tired. B: If I ___ you, I'd take a nap.
Select the subjunctive sentence.
1. If I were you... 2. If it were sunny... 3. Were I to win...
Score: /8
Practice Bank
12 exercisesIf it ___ Saturday, I wouldn't have to work.
I'd accept that job offer if I was you.
Choose the correct sentence:
Translate into English: 'Si j'étais riche, j'achèterais une grande maison.'
Arrange these words into a sentence:
Match the subjects in an 'If...were' clause with the correct 'would' outcome:
If we ___ more time, we could finish the project today.
If it was not for your help, I wouldn't finish on time.
Choose the correct sentence:
Translate into English: 'S'il travaillait moins, il serait moins stressé.'
Arrange these words into a sentence:
Match the problem with the 'If I were you' advice:
Score: /12
よくある質問 (8)
No. In casual conversation, it's very common. However, in exams or formal writing, `If I were` is the expected form.
Because it's not a past tense; it's the subjunctive mood. The form `were` for all subjects signals that the situation is imaginary.
Yes! `Could` means 'would be able to' and `might` means 'would perhaps'. Both work perfectly with the subjunctive.
`If I was` is for things that might have actually happened. `If I were` is for things that are definitely not true.
Yes. 'I wish I were taller' is the grammatically correct form for a present regret.
It is rare in casual speech but common in formal presentations, speeches, or high-level business meetings.
Technically yes, but for other verbs, the subjunctive looks exactly like the past simple (e.g., 'If I *had* a car'). 'To be' is the only verb where it looks different.
Just add 'not' after 'were'. Example: 'If I were not so busy...' or 'If I weren't so busy...'
Scaffolded Practice
1
2
3
4
Mastery Progress
Needs Practice
Improving
Strong
Mastered
In Other Languages
Imperfecto de Subjuntivo (fuera/fuese)
Spanish has many more subjunctive forms for different verbs, while English mostly only changes 'to be'.
Imparfait
French uses an indicative tense for hypotheticals, whereas English uses a specific mood form.
Konjunktiv II
German Konjunktiv II is used more broadly for all verbs, not just 'to be'.
~tara / ~ba forms
Japanese does not distinguish between 'real' and 'imaginary' as strictly through verb mood.
Law (لو)
The distinction is made by the particle 'Law' rather than a change in the verb's conjugation.
Ruguo (如果) ... dehua (的话)
Chinese relies entirely on context and specific words like 'originally' to show unreality.
Learning Path
Prerequisites
Learn These First
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