Grammar Rule in 30 Seconds
Use 'as if' or 'as though' to compare a real situation to an imaginary or improbable one using backshifted tenses.
- Use Past Tense for present unreality: 'He acts as if he owned the place' (he doesn't).
- Use Past Perfect for past unreality: 'She looked as if she had seen a ghost'.
- Use Present Tense for likely possibilities: 'It looks as if it is going to rain'.
Overview
as if と as though です。これらは、現実ではないけれど、そう見える状況を説明するための強力な武器です。C2レベルでは、単に物事を比較するだけでなく、ニュアンス、皮肉、そして仮定の話を巧みに操る能力が求められます。有名人のファッションを毒舌で評価したり、上司がコーヒーを10杯飲んだかのようにソワソワしている理由を説明したりする時に、これらのフレーズが圧倒的な正確さを与えてくれます。How This Grammar Works
as if や as though を使う場合、仮定法（subjunctive mood）を用います。現代英語では、これは通常、単純過去形のように見えます。誰かが王様のように振る舞っている（でも実際は違う）と言いたい場合、 He acts as if he *were* a king.と言います。そうです、
he や she 、さらには I であっても、 was ではなく were を使うのです。これはフォーマルな書き言葉やハイレベルな話し言葉で今でも根強く残っている古風な文法ルールです。しかし、その状況が実際に起こり得る場合は、直接法（通常の時制）のままにします。例えば、黒い雲を見て「雨が降りそうだ」と言うなら、 It looks as if it *is* going to rain.となります。雨は現実的な可能性なので、過去形は使いません。ポイントは「現実か、それとも妄想か」を見極めることです。
Formation Pattern
She looks）。
as if または as though （これらは双子のようなもので、好きな方を選んでOK）。
were ）。
had + 過去分詞）を使う。
When To Use It
as though he were a robot ）動いている」と言えますね。皮肉を言うには最適です！また、仕事の場で外交的に振る舞いたい時にも役立ちます。同僚がでしゃばりすぎている時、 You’re speaking as if this *were* your project.（まるで自分のプロジェクトであるかのように話しているね）と言えば、「これは私のプロジェクトだから口出ししないで」と遠回しに伝えることができます。SNSの世界では、
as if はキャプションの王様です。「毎日が休暇であるかのように（ as if every day were a vacation ）生きる」（実際はデスクワークですが）。また、理由や言い訳をする時の決まり文句 "It's not as if..." としても使われます。「電話しなかったけど、したくなかったわけじゃないんだ（ It's not as if I didn't want to! ）」。洗練された、あるいは少しドラマチックに聞こえさせたい時、または事実と作り話をはっきり区別したい時に使いましょう。
Common Mistakes
as if の代わりに like を使ってしまうことです。カジュアルな会話では誰もが "He looks like he's seen a ghostと言いますが、C2レベルの試験ではShe acts as if she *is* the boss" と言うと、彼女が本当にボスである可能性があることを示唆してしまいます。絶対にボスではないのなら、as ifやas thoughが求められます。もう一つの典型的なミスは、現実ではない状況で時制を戻す（バックシフト）のを忘れることです。
were や was が必要です。また、 as if と even if を混同しないでください。 Even if は条件（「たとえ雨が降っても行く」）を表し、 as if は比較（「まるでクマに追いかけられているかのように走る」）を表します。Zoom会議でこれらを間違えると、上司に「天候に関わらずクマから逃げている」と誤解されるかもしれません。それは会議の始まりとしてはかなり奇妙ですよね。Contrast With Similar Patterns
- Like vs. As if:
Likeは前置詞で、通常は名詞が続きます（He runs like a cheetah
）。As ifは接続詞で、完全な節が続きます（He runs as if a cheetah were chasing him
）。 - As vs. As if:
Asは実際の役割に使われます（He works as a waiter
）。As ifはフリをする時に使われます（He acts as if he were a waiter
）。 - As though vs. As if: これらは99%同じです。
As thoughの方がイギリス英語で少し一般的で、響きもわずかにフォーマルですが、どちらを使っても全く問題ありません。
Quick FAQ
文の頭に as if を使えますか？
もちろんです！ "As if I didn't have enough to do already!" （ただでさえ忙しいのに！）は、追加の仕事に対して不満を言う時によく使われる表現です。
書く時は as though の方がいいですか？
少し「文学的」に聞こえるので、小説やフォーマルなエッセイを書くならそちらを選びましょう。LINEやメールなら as if で十分です。
常に were を使うべきですか？
C2レベルの試験なら、答えは「イエス」です。友達と飲みに行っている時なら was でも全く問題ありません。でも were を使うと「ちゃんと勉強している人」という感じが出て、ちょっとした自慢になりますよ。
Tense Selection for 'As If' / 'As Though'
| Scenario Type | Time Reference | Verb Form | Example |
|---|---|---|---|
|
Unreal / Imaginary
|
Present/Future
|
Past Simple / 'Were'
|
He acts as if he **were** king.
|
|
Unreal / Imaginary
|
Past
|
Past Perfect
|
She looked as if she **had seen** a ghost.
|
|
Real / Probable
|
Present
|
Present Simple/Cont.
|
It looks as if it **is raining**.
|
|
Real / Probable
|
Past
|
Past Simple
|
He looked as if he **needed** help.
|
|
Real / Probable
|
Future
|
Will / Going to
|
It feels as if we **will win**.
|
Meanings
Conjunctions used to describe how something appears or how someone behaves by comparing it to a hypothetical or imaginary situation.
Unreal/Hypothetical Comparison
Describing a situation that is known to be false or purely imaginary.
“She treats me as if I were a child.”
“He speaks as though he knew the secret, but he's clueless.”
Probable/Likely Impression
Describing a situation that seems true or is likely to happen based on evidence.
“It looks as if it's going to snow.”
“He sounds as though he's caught a cold.”
Sarcastic or Ironic Commentary
Using the structure to mock someone's behavior or pretensions.
“Oh, as if you actually care!”
“He walked in as though he'd won a gold medal for just waking up.”
Reference Table
| シチュエーション | 主節の時制 | as if/as though 節の時制 | 例文 |
|---|---|---|---|
|
現在の非現実
|
現在形
|
過去形 (were/knew)
|
She acts as if she *were* famous.
|
|
現在の非現実（過去視点）
|
過去形
|
過去形 (were/knew)
|
He spoke as though he *knew* the answer.
|
|
過去の非現実
|
現在形
|
過去完了形 (had seen)
|
It looks as if he *hadn't slept*.
|
|
過去の非現実（過去視点）
|
過去形
|
過去完了形 (had seen)
|
She cried as though she *had lost* everything.
|
|
助動詞を使った仮定
|
現在形
|
助動詞の過去形 (could/would)
|
He drives as if he *could win* a race.
|
フォーマル度スペクトル
He conducts himself as though he were the presiding officer. (Workplace behavior)
He acts as if he were the boss. (Workplace behavior)
He's acting like he's the boss. (Workplace behavior)
He's acting all high and mighty, as if! (Workplace behavior)
非現実の比較: as if / as though
主な接続詞
- as if まるで〜のように
- as though まるで〜のように
現在の非現実
- 過去形を使用 (例: were, knew)
- He acts as if he knew. 現在形(acts) + 過去形(knew)
過去の非現実
- 過去完了形を使用 (例: had seen, had been)
- She looked as though she had seen. 過去形(looked) + 過去完了形(had seen)
重要コンセプト
- 事実に反する 実際は違う
- 仮定のシナリオ 想像上の話
時制シフトのルール: as if / as though
as if / as though の正しい時制の選び方
その比較は非現実、または仮定の話ですか？
その非現実な状況は「現在/未来」のことですか？
その非現実な状況は「過去」のことですか？
非現実の比較が使われる場面
外見の描写
- • He looks as if he hadn't slept.
- • It smells as though something is burning.
仮定の振る舞い
- • She acts as if she were the boss.
- • He drives as though he owned the road.
感情的な誇張
- • She cried as if her world had ended.
- • He cheered as though he'd won the lottery.
物語・劇的な効果
- • The silence was as if the world held its breath.
- • The ghost appeared as though it belonged there.
レベル別の例文
He looks like a king.
He looks like a king.
It looks like rain.
It looks like rain.
She is like her mother.
She is like her mother.
This tastes like apple.
This tastes like apple.
It looks as if it is hot outside.
It looks as if it is hot outside.
She acts as if she is tired.
She acts as if she is tired.
He talks as if he is the teacher.
He talks as if he is the teacher.
They look as if they are lost.
They look as if they are lost.
He behaves as if he owns the car.
He behaves as if he owns the car.
She looks as though she's had some bad news.
She looks as though she's had some bad news.
It feels as if summer is finally here.
It feels as if summer is finally here.
He acts as if he was rich.
He acts as if he was rich.
He treats the office as if it were his own home.
He treats the office as if it were his own home.
She spoke as though she knew everyone in the room.
She spoke as though she knew everyone in the room.
It looks as if the company is going to expand.
It looks as if the company is going to expand.
They looked at me as if I had two heads.
They looked at me as if I had two heads.
He recounted the story as if he had been there himself.
He recounted the story as if he had been there himself.
The child was crying as though her heart would break.
The child was crying as though her heart would break.
It isn't as if we haven't tried to help him.
It isn't as if we haven't tried to help him.
He stared at the painting as if mesmerized by its depth.
He stared at the painting as if mesmerized by its depth.
The diplomat handled the crisis as though he were navigating a minefield.
The diplomat handled the crisis as though he were navigating a minefield.
She carries herself as if she were born to royalty.
She carries herself as if she were born to royalty.
He looked as though he hadn't slept for a week, though I knew he'd just returned from vacation.
He looked as though he hadn't slept for a week, though I knew he'd just returned from vacation.
It is not as if the evidence were particularly compelling.
It is not as if the evidence were particularly compelling.
間違えやすい
Learners think they both mean 'hypothetical'.
Using 'like' in formal writing.
よくある間違い
He looks as a king.
He looks like a king.
It looks as if rain.
It looks as if it is raining.
He acts as if he is rich (when he is poor).
He acts as if he were rich.
She looked as if she saw a ghost (yesterday).
She looked as if she had seen a ghost.
文型パターン
He/She acts as if ___.
It is not as if ___.
Real World Usage
I want to handle challenges as if they were opportunities.
She's posting as if she's on vacation every day lol.
The wind howled as though it were a wounded beast.
You're working as if you've already finished the project—slow down!
As if he actually said that to her! 😱
The defendant acted as if he had no knowledge of the contract.
「非現実」を表す時制のシフト
He talks as if he had known the secret all along.
フォーマルな場での 'like' は避けて
It appeared as though the negotiations had stalled.
主語に関わらず 'were' を使う
She behaves as if she were in charge.
皮肉や誇張での活用
シナリオで練習しよう
He spoke as though he were a king.
Smart Tips
Replace 'like' with 'as though' and use 'were' for all subjects.
Check if the speaker is making a guess (real) or a metaphor (unreal).
Use the Past Perfect to show the 'unreal' event happened before the 'real' observation.
Use an elliptical clause (as if + adjective).
発音
Liaison in 'As if'
The 's' in 'as' often carries a /z/ sound and links to the 'i' in 'if'.
Sarcastic 'As if!'
As if! ↗↘
The pitch rises sharply on 'if' and falls to show total disbelief.
暗記しよう
記憶術
AS IF = Always Subjunctive If Fictional.
視覚的連想
Imagine a theater mask. When you put on the mask (use 'as if'), you are pretending. The 'pretend' world needs a 'past' tense to separate it from the real world.
Rhyme
If it's true, the tense stays near. If it's fake, the past is here.
Story
A man named Bob acts as if he were a millionaire. He walks into a car dealership as though he had already bought the most expensive car. The dealer looks at him as if he were crazy, because Bob is actually wearing pajamas.
Word Web
チャレンジ
Write three sentences about a celebrity. One real ('He looks as if...'), one unreal present ('He acts as if...'), and one unreal past ('He spoke as if...').
文化メモ
The phrase 'As if!' became a famous 1990s slang term (notably from the movie Clueless) to express 'No way!' or 'I don't think so!'
British authors often prefer 'as though' in narrative prose to create a more rhythmic, formal tone.
The construction 'as if' combines the comparative 'as' with the conditional 'if', dating back to Middle English.
会話のきっかけ
If you could act as if you were anyone else for a day, who would it be?
Have you ever seen someone behaving as if they had won the lottery?
日記のテーマ
よくある間違い
Test Yourself
He ordered the entire menu as if he ___ eaten for a week.
正しい文を選んでください：
Arrange the words in the correct order:
All words placed
Click words above to build the sentence
Score: /3
練習問題
8 exercisesHe treats his dog as if it ___ a human being.
She looked at the bill as if she ___ (not/see) such a high price before.
Find and fix the mistake:
It looks as if it were going to rain later today.
He isn't a millionaire, but he spends money like one.
'As though' is generally more formal than 'as if'.
A: Why is he so quiet? B: I don't know. He acts as if ___.
Select the realistic comparison.
1. He ran as if... / 2. It looks as if... / 3. He spoke as if...
Score: /8
Practice Bank
12 exercisesThe comedian told the joke as if he ___ heard it for the first time.
He walks as if he is floating on air.
正しい文はどれですか？
「彼女はまるで私のことを知らないかのような目で私を見た」を英語にしてください。
単語を並べ替えてください：
主節と適切な as if 節を組み合わせてください：
She described the exotic journey as though she ___ there many times.
The boss looked at me as if I stole his lunch.
文法的に正しいのはどれですか？
「まるでそれが最後の食事であるかのように」を訳してください。
並べ替えてください：
文の前後を正しくつなげてください：
Score: /12
よくある質問 (8)
Yes, in informal spoken English, `was` is very common (e.g., 'He acts as if he was rich'). However, for exams and formal writing, `were` is preferred.
There is no difference in meaning. `As though` is slightly more formal and more common in British literature.
Use the Present Simple when the situation is likely to be true (e.g., 'It looks as if it is raining').
In casual speech, yes. In formal writing, no. `As if` is a conjunction that introduces a clause, while `like` is a preposition.
We use the Past Perfect to describe an unreal comparison about the past (e.g., 'He looked as if he had seen a ghost'—but he hadn't).
No, it can be an exclamation used to show disbelief or to say 'No way!'
Only when the comparison is unreal or hypothetical. If it's a real possibility, use the indicative mood.
Yes, in elliptical clauses like 'He nodded as if asleep' (short for 'as if he were asleep').
Scaffolded Practice
1
2
3
4
Mastery Progress
Needs Practice
Improving
Strong
Mastered
In Other Languages
como si
Spanish is more strict about the subjunctive than modern spoken English.
comme si
French uses the imperfect where English uses the past simple/subjunctive.
als ob / als wenn
German word order changes (verb at the end) in these clauses.
まるで...のように (marude... no you ni)
Japanese does not use tense backshifting to distinguish real from unreal.
كأن (ka'anna)
The distinction between real and unreal is usually contextual rather than morphological.
好像 (hǎoxiàng)
No verb conjugation or tense shifts exist to mark the hypothetical nature.
Learning Path
Prerequisites
関連動画
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