Grammar Rule in 30 Seconds
Hedging allows you to express uncertainty or politeness by softening your claims using specific adverbs like 'probably', 'perhaps', and 'possibly'.
- Use 'probably' for high certainty (75%+), usually placed after 'be' but before other main verbs: 'He is probably late.'
- Place 'perhaps' at the start of a sentence for a more formal, polite tone: 'Perhaps we should reconsider.'
- Use 'possibly' for lower probability or in polite requests/denials: 'I couldn't possibly accept that gift.'
Overview
I'll be there at 8（8時に行くね）とメッセージを送った後、7時45分の時点でまだパジャマ姿だと気づいたことはありませんか？誰にでも経験があるはずです。英語では、100%断言することは、時に大胆すぎる行動となります。丁寧な会話においては、少し攻撃的に聞こえてしまうこともあるのです。そこで登場するのが「ヘッジ（ぼかし表現）」です。ヘッジは、文章にデジタルフィルターをかけるようなものです。衝撃を和らげ、「そう思うけれど、断定はしないでね」というニュアンスを加えます。C1レベルでは、単に単語を覚えるだけでなく、相手の期待値をどうコントロールするかを学びます。Possibly、probably、perhaps は、そのための主要なツールです。これらを使うことで、未来について推測したり、丁寧な提案をしたり、Zoom会議で「知ったかぶり」に見えるのを避けたりできます。言語的な「肩をすくめる動作」だと考えてください。後で間違いが証明されたときに、自分を守ってくれます。さらに、英語の社会的ニュアンスを理解しているネイティブスピーカーのように聞こえるようになります。これらの言葉を使うのは、太陽が出てこないときに気象予報士が仕事を失わないようにするための方法と同じなのです！How This Grammar Works
Probably は約75〜80%です。ほぼ確信していますが、どんでん返しの可能性が少しあります。Perhaps は真ん中の約50%です。究極の「たぶん」です。上品で、少しフォーマルで、非常にバランスが取れています。Possibly はバッテリー残量警告のようなもので、約20〜30%です。「可能性はゼロではないけれど、お昼代を賭けるほどではない」という意味です。これらを使うとき、自分の発言をどの程度信頼すべきかを相手に正確に伝えています。通常、これらは文の「中間位置」に置かれます。つまり、動詞の近くにいたいのです。to be 動詞を使う場合はその後に置きます。will や have のような助動詞がある場合は、その直後に置きます。Possibly は、お母さんに皿洗いを終わらせたか聞かれ、すぐにシンクをチェックされないことを願っているときに使う言葉です。大人の世界の「やったかもしれない」なのです。
Formation Pattern
He probably forgot the meeting.
It is perhaps too late to order pizza.
We have possibly lost the Uber driver.
Probably は否定語の *前* に置きます。
I probably won't go.（注意: Perhaps と possibly は通常これを行わず、否定語の後か文頭に置きます）
Perhaps や Possibly は文のトーンを決めるために文頭に置くことができます。
Perhaps we should just stay home and watch Netflix.
probably と possibly だけが、通常は付け足しのように文末で使われます。
He's coming, probably.
When To Use It
perhaps は救世主です。争いを起こさずに丁寧に反対する手段となります。You are wrong（あなたは間違っている）と言う代わりに、Perhaps there is another way to look at this.（おそらく、別の見方もあるでしょう）と言います。洗練されて聞こえます。Probably は日常的に最もよく使われる表現です。天気や到着時間、新しいマーベル映画がヒットするかどうかなどに使います。Possibly はブレインストーミングに最適です。Slackでチームが行き詰まっているとき、Could we possibly try a different API?（もしかしたら、別のAPIを試せませんか？）と提案できます。命令ではなく、チームでの取り組みのように感じさせます。また、丁寧に相手をかわすのにも最適です。I can't possibly make it tonight, I'm buried in work.（今夜はどうしても無理です、仕事に埋もれています。たとえその「仕事」が12ステップのスキンケア・ルーチンだったとしても）。
Common Mistakes
I might probably go. のように言う人がよくいますが、これは冗長です。どちらか一つを選んで使いましょう！帽子を二つ同時に被るようなもので、混乱を招くだけで不要です。もう一つの間違いは、否定文における probably の位置です。多くの学習者が I won't probably go. と言いますが、ダメです！I probably won't go. でなければなりません。probably は主役になりたいので、最初に来るのです。また、maybe の使いすぎにも注意しましょう。友達へのメッセージなら maybe で十分ですが、C1レベルのエッセイやプレゼンなら、perhaps や possibly を使ったほうがずっと有能に見えます。本当に90%確信があるときは possibly を使わないでください。I will possibly be at your wedding（おそらく結婚式に行けるでしょう）と言ってしまうと、友達は欠席する口実を探しているのではないかと思うかもしれません。適切な程度の確信に合ったツールを使いましょう。ケーキを切るのにチェーンソーを使うようなもので、技術的には可能ですが、ぐちゃぐちゃになってしまいます。Contrast With Similar Patterns
Maybe や Likely とどう違うのでしょうか？Maybe はカジュアルな年下の弟。文の最初に置かれることがほとんどです。Perhaps はよりエレガントな年上の姉。同じ意味ですが、perhaps は夜の華やかなパーティーで歓迎されますが、maybe はバーガーショップのままです。Likely は実際には副詞だけでなく形容詞でもあります。It is likely that...（その可能性が高い）や He is likely to...（彼は〜しそうだ）と言います。より「データに基づいた」感じになります。科学者が likely と言うときは、証拠があります。友達が probably と言うときは、直感です。Possibly は maybe よりもさらに弱いです。何かが不可能ではないけれど、確実な賭けではないことを示唆します。I might win the lottery（たぶん宝くじが当たる）と I could possibly win if I actually bought a ticket（実際に宝くじを買えば当たるかもしれない）の違いです。どれを選ぶかは、自分の発言に対してどの程度コミットしたいかによります。Quick FAQ
友達へのメッセージに perhaps を使ってもいいですか？
使えますが、少し気取って聞こえるかもしれません。カジュアルな雰囲気なら probably や maybe を使いましょう。
なぜ probably は won't の前なのですか？
英語は否定の前に確信の度合いを強調することを好みます。これは英語の風変わりなルールの一つです！
possibly は probably よりもフォーマルですか？
必ずしもそうではありません。単に可能性が低いことを示します。ただし、Could you possibly...? のような依頼では、非常に丁寧でフォーマルです。
I probably am と I am probably のどちらが正しいですか？
どちらも使えます！ I am probably がより標準的ですが、I probably am は確信を少し強調します。
perhaps は常に文頭ですか？
いいえ、中間にも置けますが、文頭に置くのはイギリス英語で非常によく見られます。
Placement of Adverbs of Probability
| Verb Type | Placement | Example |
|---|---|---|
|
Verb 'to be'
|
After the verb
|
She is **probably** right.
|
|
Single Main Verb
|
Before the verb
|
They **possibly** know the way.
|
|
Auxiliary + Verb
|
After the first auxiliary
|
We have **probably** seen it.
|
|
Negative Auxiliary
|
Before the auxiliary
|
I **probably** won't go.
|
|
Modal Verbs
|
After the modal
|
It could **possibly** work.
|
Informal Contractions
| Full Form | Informal Form | Context |
|---|---|---|
|
Probably
|
Prolly
|
Texting/Casual Speech
|
|
Perhaps
|
N/A
|
Always formal
|
|
Possibly
|
N/A
|
Always formal/neutral
|
Meanings
Hedging is the use of linguistic devices to express hesitation, uncertainty, or to soften the impact of a statement to remain polite or academically objective.
Expressing High Probability
Using 'probably' to indicate that something is very likely to happen or be true, though not 100% certain.
“We will probably finish the project by Friday.”
“It's probably going to rain later this afternoon.”
Formal Softening/Suggestion
Using 'perhaps' to make a suggestion less direct or to introduce a possibility in a formal context.
“Perhaps you would like to join us for dinner?”
“This is, perhaps, the most important discovery of the decade.”
Low Probability or Extreme Politeness
Using 'possibly' to indicate a slim chance or to soften a request/refusal to the highest degree.
“Could you possibly help me with this heavy box?”
“It is possibly the worst film I have ever seen.”
Reference Table
| 副詞 | 確信度 | 一般的な位置 | ニュアンス／丁寧さ |
|---|---|---|---|
|
`Probably`
|
高 (70-90%)
|
助動詞と主動詞の間；`to be`の後
|
強い期待、確信のある推測、よりインフォーマル
|
|
`Perhaps`
|
中～低 (30-60%)
|
文頭；主動詞の前
|
より控えめ、会話的、丁寧な提案
|
|
`Possibly`
|
中～低 (30-60%)
|
文頭；主動詞の前
|
わずかにもっと低い可能性、よりフォーマル、時にためらい
|
|
`Maybe`
|
中～低 (30-60%)
|
文頭；主動詞の前
|
`perhaps`／`possibly`のインフォーマルな代替
|
|
`Certainly`
|
高 (95-100%)
|
助動詞と主動詞の間；`to be`の後
|
高い確信、強い保証、直接的
|
フォーマル度スペクトル
Perhaps I shall be delayed. (Arriving at a meeting/hangout.)
I'll probably be late. (Arriving at a meeting/hangout.)
I'll prolly be late. (Arriving at a meeting/hangout.)
Might be a bit, my bad. (Arriving at a meeting/hangout.)
ヘッジ副詞の技術：Probably, Perhaps, Possibly
高い可能性
- Probably 強い期待
中～低の可能性
- Perhaps 丁寧な提案、会話的
- Possibly 遠い可能性、フォーマル
機能
- 丁寧さ 直接的な表現を避ける
- ニュアンス 不確実性を示す
- フォーマルさ 専門的な文脈
可能性のスペクトラム：Probably vs. Perhaps/Possibly
ヘッジ副詞の選び方
どのくらい確信していますか？
強い期待ですか (70-90%)？
丁寧で控えめな提案をしたいですか？
遠い、または理論的な可能性ですか (30-60%)？
ヘッジ表現の用法
丁寧さと外交性
- • アイデアを優しく提案する
- • やんわりと意見を異にする
- • 控えめな意見を述べる
予測と推測
- • 天気予報をする
- • 到着時間を推定する
- • 知識に基づいた推測をする
学術的・専門的
- • 研究結果を発表する
- • 公式報告書を作成する
- • プロジェクトのリスクを議論する
日常会話
- • 計画をテキストで送る
- • カジュアルな推測
- • 些細な疑問を表明する
レベル別の例文
Maybe he is at school.
Maybe he is at school.
It is maybe a cat.
It is maybe a cat.
Maybe I will go.
Maybe I will go.
Is it maybe yours?
Is it maybe yours?
He is probably tired.
He is probably tired.
It will probably rain.
It will probably rain.
I can possibly come.
I can possibly come.
They are probably late.
They are probably late.
Perhaps we can meet tomorrow?
Perhaps we can meet tomorrow?
I probably won't see her today.
I probably won't see her today.
This is possibly the best pizza in town.
This is possibly the best pizza in town.
He has probably already left.
He has probably already left.
Could you possibly open the window?
Could you possibly open the window?
The meeting was, perhaps, a bit too long.
The meeting was, perhaps, a bit too long.
They will probably have finished by the time we arrive.
They will probably have finished by the time we arrive.
I couldn't possibly accept such a generous offer.
I couldn't possibly accept such a generous offer.
The economic downturn was probably exacerbated by the pandemic.
The economic downturn was probably exacerbated by the pandemic.
Perhaps it would be prudent to wait for more data.
Perhaps it would be prudent to wait for more data.
One could possibly argue that the policy was a failure.
One could possibly argue that the policy was a failure.
He is probably not the best candidate for this specific role.
He is probably not the best candidate for this specific role.
The author is, perhaps, overstating the significance of this event.
The author is, perhaps, overstating the significance of this event.
I couldn't possibly have known the repercussions at the time.
I couldn't possibly have known the repercussions at the time.
It is probably the case that the system requires a total overhaul.
It is probably the case that the system requires a total overhaul.
Perhaps nowhere is this more evident than in his later works.
Perhaps nowhere is this more evident than in his later works.
間違えやすい
Learners confuse the adverb 'maybe' with the verb phrase 'may be'.
'Probably' is an adverb; 'Likely' is usually an adjective.
よくある間違い
I will go maybe.
Maybe I will go.
He probably is late.
He is probably late.
I won't probably come.
I probably won't come.
Maybe the results are wrong.
Perhaps the results are incorrect.
文型パターン
I ___ won't be able to ___.
Could you ___ help me with ___?
Real World Usage
I could possibly start as early as next Monday.
I'll prolly be there in 5.
Perhaps the most significant factor was the change in leadership.
Could I possibly get a refund for this?
You're probably right about the first point, but...
It will probably be sunny tomorrow.
確信度を測る
ヘッジしすぎない
丁寧な提案には「Perhaps」
直接的表現の文化的ニュアンス
語順に注目する
Smart Tips
Start your sentence with 'Perhaps'. It makes your disagreement sound like a suggestion.
Always put 'probably' first. It's the #1 mistake advanced learners make.
Use 'almost certainly' instead of 'probably' for even more precision.
Use 'Could I possibly...'. It's the 'magic key' for politeness.
発音
The 'Probably' Contraction
In fast speech, 'probably' often sounds like 'prob-ly' (two syllables) or even 'pro-ly'.
Perhaps Stress
The stress is on the second syllable: per-HAPS.
Rising on 'Possibly'
Could you possibly... ⤴
Conveys extreme politeness and a lack of pressure on the listener.
暗記しよう
記憶術
PPP: Probably (Pretty sure), Perhaps (Polite/Professional), Possibly (Paltry chance).
視覚的連想
Imagine a weather forecast. 'Probably' is a big sun with one small cloud. 'Perhaps' is a 50/50 split screen. 'Possibly' is a dark sky with one tiny ray of light.
Rhyme
If you're sure but not quite, 'probably' is usually right. If you want to be polite, 'perhaps' will shine a light.
Story
A detective is solving a crime. He says, 'He **probably** did it' (he has evidence). Then he says, '**Perhaps** there is another way' (he's being thoughtful). Finally, he says, 'Could he **possibly** be innocent?' (he's exploring a slim chance).
Word Web
チャレンジ
Write three sentences about your plans for next year: one using 'probably', one using 'perhaps', and one using 'possibly'. Check your word order!
文化メモ
British speakers use hedging significantly more than American speakers to avoid appearing 'brash' or 'rude'. 'Perhaps' is very common in daily British speech.
In Western academia, 'hedging' is a sign of high-quality research. Stating something as 100% certain is often seen as unscientific.
While hedging is used, American business culture often values 'directness'. Over-using 'possibly' can sometimes be interpreted as a lack of confidence.
'Probably' comes from the Latin 'probabilis' (provable). 'Perhaps' is a 15th-century compound of 'per' (by) and 'hap' (chance/luck).
会話のきっかけ
What are you probably going to do this weekend?
Perhaps you could tell me about your favorite travel memory?
Do you think AI will probably replace most jobs in the future?
日記のテーマ
よくある間違い
Test Yourself
I think she will ___ accept the job offer.
Probablyは高い確信度を示すので、仕事のオファーが受け入れられると期待する文脈に合っています。正しい文を選んでください:
Perhapsは提案を和らげ、命令ではなく、丁寧で議論の余地があるものにします。Find and fix the mistake:
He possibly is busy with his new project.
to beを使う場合、possiblyのような副詞は通常、to beの後に来ます。Possibly he is busy...も強調のためには正しいです。Score: /3
練習問題
8 exercisesWhich sentence is correct?
Could you ___ help me carry these bags? (Very polite)
Find and fix the mistake:
He probably is the best player on the team.
Maybe we should start the meeting now.
Probably, Possibly, Definitely
A: Are you coming tonight? B: I ___ won't, I have too much work.
'Perhaps' is more informal than 'maybe'.
possibly / couldn't / I / that / do
Score: /8
Practice Bank
12 exercisesThe concert will ___ start a bit late, as usual.
最も確信度が低いことを示している文を選んでください:
I perhaps should have checked the weather before leaving.
Translate into English: 'Quizás él se sienta mejor mañana.'
これらの単語を並べ替えて文を作ってください:
副詞と確信度の最も適切な説明を一致させてください:
The board will ___ consider your proposal.
You should leave now.
Translate into English: 'Quizás podríamos revisar los datos una vez más.'
これらの単語を並べ替えて文を作ってください:
最も可能性が高い選択肢を選んでください:
ヘッジ副詞とその主な用途を一致させてください:
Score: /12
よくある質問 (8)
It is rare in formal English. Usually, we use `Perhaps` or `Maybe` at the start. If you use `Probably` at the start, it's usually in informal speech as a short answer: 'Probably.'
`Perhaps` is about the speaker's uncertainty or politeness. `Possibly` is about whether something is actually able to happen (feasibility).
No, `prolly` is very informal slang used in texting. In any work email, use `probably` or `likely`.
It goes after 'have': 'I have `probably` seen this before.'
Yes, but only for emphasis, usually when contradicting someone. 'You aren't ready!' 'I `probably` am!'
The adverb is one word: `maybe`. The verb phrase is two: `may be`. Example: 'Maybe he may be late.'
It's a cultural preference for 'understatement' and politeness. It avoids sounding too aggressive or certain.
Yes! 'Could you `possibly`...' is one of the most polite ways to ask for a favor in English.
Scaffolded Practice
1
2
3
4
Mastery Progress
Needs Practice
Improving
Strong
Mastered
In Other Languages
Probablemente / Tal vez
English word order is much stricter.
Peut-être / Probablement
English doesn't require 'that' after 'perhaps'.
Vielleicht / Wahrscheinlich
German verb placement is more rigid.
Tabun (多分)
Japanese hedges through grammar at the end of the sentence.
Rubbama (ربما)
Arabic uses different particles for different levels of doubt.
Kěnéng (可能)
English adverbs have more specific 'mid-position' rules.
Learning Path
Prerequisites
Learn These First
関連動画
06:59 No, honey can’t cure your allergies
05:31 This is what happens in your brain when you can’t recall a word - Cella Wright
06:12 Scientists still don't know the answer to this infamous question - Charles Wallace & Dan Kwartler
ALL Grammar for ADVANCED (C1 Level) English in 12 minutes in 2025
English with Lucy
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