Grammar Rule in 30 Seconds
Use past participles to replace 'which was' or 'because it was' for elegant, professional, and concise English writing.
- Drop the subject and 'be' verb: 'The book, which was written in 1920' becomes 'Written in 1920'.
- Ensure the subjects match: The person/thing doing the action in both clauses must be identical.
- Use for reasons or descriptions: 'Shocked by the news, she fainted' (Because she was shocked).
Overview
because や which を多用して、一つひとつの要素を丁寧に説明する傾向があります。しかし、ネイティブスピーカーや洗練された学術的・ビジネス的文章では、文を「圧縮」し、よりエレガントに、かつ効率的に情報を伝える技術が求められます。その中核を成すのが、今回解説する「過去分詞による分詞構文（Past Participle Clauses）」です。be 動詞や接続詞を省略することで、文をスリム化する役割を果たします。日本語では「〜された」「〜された状態で」といった表現に対応しますが、英語の過去分詞句は、名詞を修飾する形容詞のような働きから、理由や付帯状況を表す副詞のような働きまで、非常に多岐にわたる役割を担います。The building designed by the famous architect yesterday...
V3）は、それ自体に「〜される」「〜された」という受動的な意味を持っています。したがって、be 動詞がなくても、過去分詞を置くだけで「受け身」のニュアンスを維持したまま、文を圧縮できるのです。The proposal (which was) submitted last week...→The proposal submitted last week...
which was が省略されていますが、submitted という形だけで「提出された」という受動の意味が明確に伝わります。The book which was written in 1920... | The book written in 1920... | 名詞修飾（形容詞的） |Because he was inspired by the speech, he... | Inspired by the speech, he... | 理由・背景（副詞的） |If it is used correctly, this tool... | Used correctly, this tool... | 条件（副詞的） |who/which/that + be動詞 を省略する形です。The products manufactured in this factory are exported worldwide.
A letter signed by the CEO arrived this morning.
be 動詞を省略し、過去分詞から文を始めます。主節の主語に対する追加情報や背景を説明します。Shocked by the news, she couldn't say a word.
Because she was shocked... の圧縮形。Located on a hill, the hotel offers a great view.
Since it is located... の圧縮形。He sat by the window, lost in thought.
The team finished the project, exhausted but satisfied.
- 1情報の密度を高めたい時（Conciseness）
which was や because it is を繰り返すと、文章が冗長で幼稚な印象を与えてしまいます。過去分詞句を使うことで、プロフェッショナルで引き締まった印象になります。- 1動作の主体（Agent）よりも「状態」や「結果」を強調したい時
The data, collected over ten years, shows... と言う場合、誰が収集したかよりも、データが「10年かけて収集されたものである」という属性が強調されます。- 1文の構造にバリエーションを持たせたい時（Sentence Variety）
Subject + Verb で始まると、リズムが単調になります。文頭に過去分詞句を持ってくることで、読者の注意を引き、文の流れに変化をつけることができます。- 1フォーマルな描写が必要な時
Surrounded by fans, the actor smiled. と書くことで、The actor was surrounded by fans, and he smiled. よりも、その場の状況が一体となった鮮明なイメージを読者に与えることができます。- Incorrect:
Built in the 17th century, tourists often visit the castle. - Analysis: 日本語では「17世紀に建てられたので、観光客はその城をよく訪れる」と言っても違和感がありません。しかし、英語のルールでは、文頭の
Builtの主語は主節の主語であるtouristsになってしまいます。これでは「17世紀に建てられた観光客」という意味不明な文になってしまいます。 - Correct:
Built in the 17th century, the castle is often visited by tourists. - Correct:
Tourists often visit the castle, built in the 17th century.
- Incorrect:
I was boring with the lecture. - Analysis:
boringは「（他者を）退屈させるような性質」を指します。自分が退屈という「状態を与えられた（受動）」のであれば、過去分詞を使う必要があります。 - Correct:
Bored with the lecture, I fell asleep.
- Incorrect:
The sun disappeared behind the clouds...(これを分詞構文にしようとしてDisappeared behind the clouds, the sun...とするのは不自然な場合があります。完了の意味で使われることもありますが、基本はDisappearing...です。) - Rule: 受動の意味を持つ分詞句を作れるのは、目的語を必要とする他動詞だけです。
Broken by the wind, the branch fell. |Breaking the silence, he spoke. |Having finished the work, she left. |Being treated like a child, he got angry. |-ing、「されている」なら V3 です。Covering the table with a cloth, she...(彼女がテーブルを覆っている：能動)Covered with a cloth, the table...(テーブルが布で覆われている：受動)
BeingBeing を置くこともありますが、多くの場合、Being は省略されます。ただし、「〜されている最中なので」という進行の状態を強調したい場合や、理由をより明確にしたい場合には Being が使われることがあります。C1レベルでは、簡潔さを好むため、特別な理由がない限り Being は省略するのが一般的です。The car damaged in the accident belongs to me.(どの車か特定している：コンマなし)My car, damaged in the accident, is being repaired.(私の車、という既知の名詞に補足説明を加えている：コンマあり)
be + V3）の方が適しています。with + O + V3 との違いは何ですか？with を使った付帯状況（例：with his eyes closed）は、主節の動作と同時に起きている「周辺状況」をより具体的に描写する際に使われます。一方、単独の過去分詞句は、主語そのものの状態や、主節の原因・理由をより直接的に示す傾向があります。Interested? や Seen from here, it looks small. のような短い表現は日常会話でも頻繁に使われます。ただし、基本的には「洗練された、知的な響き」を持つ構文であると理解しておくと良いでしょう。Transforming Passive Sentences to Participle Clauses
| Original Sentence (Passive) | Step 1: Remove Conjunction/Subject | Step 2: Remove 'Be' Verb | Final Participle Clause |
|---|---|---|---|
|
Because she was tired...
|
was tired...
|
tired...
|
Tired, she went to bed.
|
|
As it was built in 1900...
|
was built in 1900...
|
built in 1900...
|
Built in 1900, the house...
|
|
If it is used correctly...
|
is used correctly...
|
used correctly...
|
Used correctly, the tool...
|
|
Since he was not seen...
|
not seen...
|
not seen...
|
Not seen for days, he...
|
|
Which was stolen...
|
stolen...
|
stolen...
|
The car, stolen last night...
|
Meanings
A past participle clause is a type of reduced clause that functions like an adjective or an adverb, providing background information or reasons in a passive sense.
Replacing Relative Clauses
Used to provide extra information about a noun, replacing 'who/which/that was'.
“The paintings, stolen from the gallery, were never found.”
“Any cars parked illegally will be towed.”
Expressing Reason or Cause
Used at the start of a sentence to explain why the main action happened, replacing 'Because/Since it was'.
“Blinded by the sun, the driver didn't see the stop sign.”
“Exhausted by the long journey, the travelers fell asleep immediately.”
Expressing Condition
Used to replace an 'if' clause in a passive sense.
“Used correctly, this tool will last a lifetime.”
“Seen from this angle, the building looks like a ship.”
Reference Table
| 元の節のタイプ | 完全な文の例 | 過去分詞句 | 文への影響 |
|---|---|---|---|
|
関係代名詞節（受動態）
|
The book, which was written in 1980, is a classic.
|
Written in 1980
|
より簡潔に、描写的に
|
|
理由の副詞節
|
Because she was motivated by success, she studied hard.
|
Motivated by success
|
原因を上品に示す
|
|
関係代名詞節（受動態）
|
The problems, which were caused by the storm, are being fixed.
|
Caused by the storm
|
効率的に詳細を追加
|
|
時・条件の副詞節
|
If it is left untreated, the problem will worsen.
|
Left untreated
|
簡潔な条件・警告
|
|
関係代名詞節（受動態）
|
The student, who was praised by the professor, smiled.
|
Praised by the professor
|
より短く、スムーズな流れ
|
|
理由の副詞節
|
As they were exhausted from the journey, they rested.
|
Exhausted from the journey
|
より明確な因果関係
|
フォーマル度スペクトル
Concerned by the potential expenditure, I declined the purchase. (Shopping/Finance)
Worried about the price, I decided not to buy it. (Shopping/Finance)
I was stressed about the money, so I skipped it. (Shopping/Finance)
Too pricey, so I bailed. (Shopping/Finance)
過去分詞句（受動態）のフロー
起源
- 関係代名詞節 例: 'which was written' → 'written'
- 副詞節 例: 'because it was damaged' → 'damaged'
機能
- 簡潔さ 説明を短くする
- 洗練さ 文章のスタイルを高める
- 原因・理由 「なぜ」を説明する（例: 'motivated'）
主要なルール
- 主語の共有 分詞の主語 = 主節の主語
よくある落とし穴
- 宙ぶらりんの分詞 主語の不一致が混乱を生む
受動態 vs 能動態の分詞句
受動態の分詞句を使うべきか？
その句の主語は行動を受けていますか？
分詞句の暗黙の主語は、主節の主語と同じですか？
簡潔さやフォーマルさのために文を短縮したいですか？
過去分詞句（受動態）が輝く場所
フォーマルな文脈
- • 学術論文
- • ニュース記事
- • ビジネスレポート
- • 法律文書
インフォーマルな使用法
- • 友達へのメッセージ（略語）
- • カジュアルな説明
- • ドラマチックな効果
文の機能
- • 詳細の追加
- • 原因・理由の説明
- • 流れの改善
- • 情報の要約
レベル別の例文
Made in Italy.
Made in Italy.
Broken heart.
Broken heart.
Closed door.
Closed door.
Fried eggs.
Fried eggs.
The lost keys were under the bed.
The lost keys were under the bed.
He bought a used car.
He bought a used car.
I like boiled vegetables.
I like boiled vegetables.
The window, broken by a ball, was fixed.
The window, broken by a ball, was fixed.
Shocked by the price, she didn't buy the dress.
Shocked by the price, she didn't buy the dress.
The man, arrested by the police, was 30 years old.
The man, arrested by the police, was 30 years old.
Hidden in the bushes, the cat watched the bird.
Hidden in the bushes, the cat watched the bird.
Written in English, the book is easy to read.
Written in English, the book is easy to read.
Left alone in the house, the child started to cry.
Left alone in the house, the child started to cry.
Surprised by the question, I didn't know what to say.
Surprised by the question, I didn't know what to say.
The bridge, built in 1890, is still in use today.
The bridge, built in 1890, is still in use today.
Not invited to the party, he felt very sad.
Not invited to the party, he felt very sad.
Convinced of his innocence, the jury acquitted him.
Convinced of his innocence, the jury acquitted him.
Viewed from a distance, the problem seems much smaller.
Viewed from a distance, the problem seems much smaller.
Given the circumstances, we decided to cancel the event.
Given the circumstances, we decided to cancel the event.
Stunned by the audacity of the claim, the scientist requested proof.
Stunned by the audacity of the claim, the scientist requested proof.
All things considered, the project was a resounding success.
All things considered, the project was a resounding success.
His reputation tarnished by the scandal, the minister resigned.
His reputation tarnished by the scandal, the minister resigned.
The battle won, the soldiers returned to their families.
The battle won, the soldiers returned to their families.
Forbidden to speak, the prisoners communicated through gestures.
Forbidden to speak, the prisoners communicated through gestures.
間違えやすい
Learners use -ing when they mean -ed. They say 'Boring by the movie' instead of 'Bored by the movie'.
The clause describes the wrong noun because the subject of the main clause is different.
For irregular verbs, learners use the past simple (V2) instead of the participle (V3).
よくある間違い
I am bore.
I am bored.
The break window.
The broken window.
Shocking by the news, he cried.
Shocked by the news, he cried.
Walking down the street, the tree fell.
Walking down the street, I saw the tree fall.
Known as a liar, nobody trusted the man.
Known as a liar, the man was trusted by nobody.
文型パターン
___ by the ___, [Subject] [Verb].
[Noun], ___ in ___, [Verb].
Not ___ by ___, [Subject] [Verb].
Real World Usage
Hostages released after negotiations.
Based on these findings, we conclude...
Store in a cool place. Keep refrigerated once opened.
Unless otherwise agreed in writing...
Haunted by his past, he could not sleep.
Highly motivated by challenges, I thrive in fast-paced environments.
Spot the 'Which Was/Were'
written in 1980, is a classic.」みたいに、頭の中で確認する簡単な方法です。Beware the Danglers!
Walking down the street, a dog bit me.」だと、犬が道を歩いていたみたいに聞こえちゃいますね。Enhance Academic Writing
conducted over five years, yielded significant results.」のように使えます。News & Headlines Love Them
Injured in the accident, the driver was hospitalized.」のような見出しをよく見かけます。Implied Conjunctions
Exhausted from the journey, they rested.」は「Because they were exhausted...」という意味ですね。Smart Tips
Try deleting those words and starting with the past participle to see if the sentence sounds more professional.
Start the sentence with the -ed participle to immediately set the mood.
Combine them by turning the first one into a participle clause.
Replace 'If it is...' with the past participle for a more concise, 'instruction manual' style.
発音
Comma Pause
When a participle clause starts a sentence, there is a slight rising intonation followed by a brief pause at the comma.
Introductory Clause
Stunned by the news, ↗ she sat down. ↘
The rising tone on 'news' indicates the thought is not yet complete.
暗記しよう
記憶術
Remember 'The 3 Ds': Drop the conjunction, Drop the subject, Drop the 'be' verb.
視覚的連想
Imagine a sentence going through a 'slimming machine'. A heavy sentence like 'Because it was made of gold' goes in, and a sleek 'Made of gold' comes out the other side.
Rhyme
When the subject is the same, drop the 'be' and win the game!
Story
A busy journalist has only 10 words left for her article. She sees 'The building, which was destroyed by fire' (8 words). She uses her grammar powers to turn it into 'Destroyed by fire, the building...' (5 words), saving space and her job.
Word Web
チャレンジ
Take three sentences from a news article starting with 'Because it was...' or 'Which was...' and rewrite them using past participle clauses.
文化メモ
In Western academia, using participle clauses is seen as a sign of high literacy and objective 'distancing' from the subject.
News headlines often omit the 'be' verb entirely to save space, creating 'headlinese' which is essentially a participle clause.
Contracts use these to define terms precisely without repeating the subject.
These structures evolved from Latin 'Absolute' constructions, which were heavily used in legal and religious texts.
会話のきっかけ
Faced with a difficult choice, how do you usually decide what to do?
Given the chance to live anywhere in the world, where would you go?
Surrounded by friends, do you feel more or less energetic?
Told that you had won the lottery, what would be your first reaction?
日記のテーマ
よくある間違い
Test Yourself
The artwork, ___ by a renowned sculptor, fetched a high price.
Find and fix the mistake:
Reading the book, the plot twists surprised me.
Choose the correct sentence:
Translate into English: 'Because he was impressed by her dedication, the manager offered her a promotion.'
Answer starts with: ["I...
Score: /4
練習問題
8 exercises____ by the sudden noise, the bird flew away.
Find and fix the mistake:
Written in 1950, I really enjoyed the book.
____ (give) enough time, I can finish the project.
Because he was exhausted by the climb, he stopped to rest.
'Hidden in the attic, the diary was safe.'
The subject of the participle clause must be the same as the subject of the main clause.
Match the following:
A: Why didn't you buy the car? B: ____ (discourage) by the high insurance costs, I decided against it.
Score: /8
Practice Bank
12 exercisesThe ancient ruins, ___ by time, stood majestically.
Having finished the report, the coffee tasted great.
Choose the correct sentence:
Translate into English: 'Como estaba frustrado por la situación, se fue temprano.'
Arrange these words into a sentence:
Match the full sentences with the correct reductions:
The email, ___ from an unknown sender, was deleted immediately.
Written by a famous author, I enjoyed the novel.
Choose the correct sentence:
Translate into English: 'The report, which was requested by the board, is due next week.'
Arrange these words into a sentence:
Match the situations with the correct participle clause:
Score: /12
よくある質問 (8)
It's a common mistake where the participle clause describes the wrong subject. For example, `Walking to the store, the rain started.` implies the rain was walking. You must ensure the subjects match.
Yes, but they sound quite formal. In casual conversation, we usually use `because` or `so`. You might hear them in speeches or formal presentations.
`Seen` describes a state or simultaneous action. `Having been seen` emphasizes that the action was completed *before* the main verb happened.
If the clause comes at the beginning, yes. If it follows the noun it describes (e.g., `The car stolen yesterday...`), you usually don't need a comma unless it's non-defining information.
Yes! Just put `not` at the very beginning. `Not surprised by the news, she continued her work.`
Because the subject of the sentence is the *receiver* of the action in the participle clause. `Struck by lightning, the tree fell` (The tree was struck).
Only with transitive verbs (verbs that take an object) because only they can be made passive.
Yes, `Given the circumstances...` is a very common fixed participle clause used to mean 'Considering the circumstances'.
Scaffolded Practice
1
2
3
4
Mastery Progress
Needs Practice
Improving
Strong
Mastered
In Other Languages
Participio absoluto
In Spanish, the participle often comes before its own subject in the clause.
Participe passé
French participles must agree in gender and number with the subject.
Partizipialattribut
German often places the entire participle phrase *before* the noun it describes.
Passive + Te-form
Japanese doesn't have a direct 'participle' equivalent; it uses verb endings to connect clauses.
Ism al-maf'ul
Arabic usually requires a relative pronoun (alladhi) unless the noun is indefinite.
Resultative Verb Compounds / Context
There is no morphological change (like -ed) in Chinese verbs.
Learning Path
Prerequisites
Learn These First
関連動画
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