Grammar Rule in 30 Seconds
Relative adverbs connect a clause to a noun (place, time, or reason) to provide more detail without repeating the noun.
- Use `where` for places: 'The cafe where we met.' (max 20 words)
- Use `when` for times: 'The day when it rained.'
- Use `why` for reasons: 'The reason why I called.'
Overview
where について説明するのに苦労したことは？もしそうなら、あなたはすでに関係副詞の必要性を感じているはずです。これら3つの小さな言葉、where、when、why は、英語における究極の円滑剤です。これらは、ぎこちなく繰り返される文章を、自然でプロフェッショナル、かつ洗練された響きのものに変えてくれます。B2レベルでは、単に事実を述べるだけでなく、アイデアをつなげることが求められます。関係副詞は架け橋のような役割を果たし、名詞（場所、時間、理由など）を、それに関するさらなる情報を提供する節に結びつけます。これらがないと、初期のAIチャットボットのように聞こえてしまいます。「ここはオフィスです。私はこのオフィスで働いています。」退屈ですよね？関係副詞を使えば、「ここは私が働いているオフィス where です」となります。ずっと良くなりました。これはガラケーから最新のスマートフォンにアップグレードするようなもので、すべてがより速くつながり、見た目も良くなります。さらに、これらを正しく使うことは、就職の面接や、なぜ why シンクがまた漏れているのかを大家さんに伝える完璧なメールを書く際に、大きな武器になります。How This Grammar Works
which（in which、at which、for which など）をよく使います。これは文法的には完璧ですが、庭のバーベキューにタキシードを着ていくようなもので、日常生活には少し堅苦しすぎることがあります。関係副詞は、物事をより会話的にするために登場します。場所には in/at which の代わりに where を、時間には in/on/at which の代わりに when を、理由には for which の代わりに why を使います。in which は素晴らしいです」と言うこともできますが、おそらく変な目で見られるでしょう。代わりに、「私がトレーニングしているジム where は素晴らしいです」と言います。関係副詞 where は前置詞と代名詞の両方の役割を果たします。名詞の「ジム」を指し示し、「トレーニングしている」という詳細を導入します。効率的で、すっきりしており、文末で前置詞につまずくのを防いでくれます。一つ覚えておいてほしいのは、これらの副詞は常に名詞の後に来るということです。これらは単独で浮いているのではなく、特定の場所、時間、理由に固定されています。もしその固定された名詞がなければ、それらは疑問副詞（質問に使うもの）として機能している可能性があり、それは全く別のものです。
Formation Pattern
where、when、または why）を追加します。
where | This is the cafe where we met. | これは私たちが会ったカフェです。
when | I remember the day when it rained. | 雨が降った日のことを覚えています。
why | That’s the reason why I’m late. | それが私が遅れた理由です。
why を完全に省略することがよくあります！)
why I'm late."
for which I am late." (法的文書を書く場合に使いましょう)。
Where = 地図のピン（場所）
When = カレンダーの予定（時間）
Why = 思考の吹き出し（理由）
where に行ってきたよ。」
where ？」
why だよ。」
why はありますか？」
where にいるんです。」
This is the park where we played.
when を使って特定の時代を説明する。「90年代はみんながネオンカラーを着ていた時代 when だった。」
why を使う。「インターンのせいにせずに、プロジェクトが遅れた理由 why を説明できますか？」
When To Use It
- 場所の場合：
house、city、room、website、さらにはsituation（状況）などの名詞と一緒にwhereを使います。はい、「状況」も「場所（どこ）」になり得ます！ "I'm in a situationwhereI need your help." - 時間の場合：
day、year、moment、age、eraなどの名詞と一緒にwhenを使います。I love the moment
whenthe weekend finally starts. - 理由の場合： ほとんどの場合、名詞
reasonの後にwhyを使います。これはその単語専用の特別なツールのようです。There are many reasons
whyyou should learn English.
Common Mistakes
where vs. which の対決です。The house where I bought is expensive.The house which I bought is expensive.The house where I live is expensive.which を使います。名詞が動作の場所（家に住んでいる）である場合は、where を使います。簡単なテスト方法は？最後に in it を付けてみてください。意味が通れば where を使います。Contrast With Similar Patterns
関係副詞は関係代名詞とどう違うのでしょうか？
1. 関係代名詞 (who, which, that)： これらは節の主語または目的語として機能します。
The car which is red...
2. 関係副詞 (where, when, why)： これらは副詞として機能します。状況（場所、時間、理由）を説明します。
Quick FAQ
when の代わりに that を使えますか？The day that we met は非常に一般的です。The reason why... と言うのは重複していますか？where を使えますか？books や movies などに使えます。Relative Adverb Sentence Structure
| Noun Type | Relative Adverb | Subject | Verb Phrase | Full Example |
|---|---|---|---|---|
|
Place
|
where
|
I
|
work
|
The office where I work is nearby.
|
|
Time
|
when
|
she
|
arrived
|
The day when she arrived was cold.
|
|
Reason
|
why
|
they
|
left
|
The reason why they left is unknown.
|
|
Place (Abstract)
|
where
|
we
|
stand
|
The point where we stand is critical.
|
|
Time (Specific)
|
when
|
the bell
|
rings
|
The moment when the bell rings...
|
Omission of Relative Adverbs (Informal)
| Full Form | Short Form (Omitted) | Naturalness |
|---|---|---|
|
The reason why I'm here
|
The reason I'm here
|
Very Natural
|
|
The day when we met
|
The day we met
|
Very Natural
|
|
The place where I live
|
The place I live
|
Common (but 'where' is safer)
|
Meanings
Relative adverbs introduce relative clauses that modify a noun. They function as a replacement for a preposition + 'which' (e.g., 'in which', 'at which', 'for which').
Place (Where)
Used to modify a noun referring to a location or physical space.
“That is the house where I grew up.”
“We visited the park where the festival is held.”
Time (When)
Used to modify a noun referring to a specific time, date, or period.
“I'll never forget the summer when we traveled to Italy.”
“There are times when I just want to be alone.”
Reason (Why)
Used specifically after the noun 'reason' to explain a cause or motive.
“The reason why she left is still a mystery.”
“I don't know the reason why the flight was canceled.”
Reference Table
| 関係副詞 | 修飾する対象 | 例文 | 書き換え（フォーマル） |
|---|---|---|---|
|
where
|
場所 (location)
|
This is the city where I grew up.
|
in which / at which
|
|
when
|
時間 (moment/period)
|
Do you remember the day when we met?
|
on which / at which
|
|
why
|
理由 (motive/cause)
|
That's the reason why he left.
|
for which
|
フォーマル度スペクトル
The reason for which the meeting was postponed remains unclear. (Professional/Office)
The reason why the meeting was postponed is unclear. (Professional/Office)
The reason the meeting was moved is a mystery. (Professional/Office)
No clue why the meeting got canned. (Professional/Office)
関係副詞：アイデアを繋ぐ
Where (場所)
- 家 where I grew up
- 都市 where we met
When (時間)
- 日 when we first met
- 年 when it happened
Why (理由)
- 理由 why she left
- それが〜だ why I'm here
関係副詞 vs 関係代名詞
正しい関係副詞の選び方
その節は『場所』を説明していますか？
その節は『時間』を説明していますか？
その節は『理由』を説明していますか？
関係副詞が置き換えるもの
Where が置き換えるのは...
- • at which
- • in which
- • to which
- • at that place
When が置き換えるのは...
- • at which
- • on which
- • in which
- • at that time
Why が置き換えるのは...
- • for which
- • for that reason
レベル別の例文
This is the park where I play.
This is the park where I play.
I like the time when we have dinner.
I like the time when we have dinner.
That is the shop where I buy bread.
That is the shop where I buy bread.
Monday is the day when I go to school.
Monday is the day when I go to school.
Do you know the reason why she is sad?
Do you know the reason why she is sad?
I remember the year when I moved here.
I remember the year when I moved here.
This is the hospital where my brother works.
This is the hospital where my brother works.
Is there a place where we can sit down?
Is there a place where we can sit down?
The town where I grew up has changed a lot.
The town where I grew up has changed a lot.
I'll never forget the moment when I won the race.
I'll never forget the moment when I won the race.
The reason why I didn't call was that I lost my phone.
The reason why I didn't call was that I lost my phone.
We need to find a time when everyone is free.
We need to find a time when everyone is free.
It was a situation where nobody knew what to do.
It was a situation where nobody knew what to do.
There are several reasons why this project might fail.
There are several reasons why this project might fail.
The era when the internet was invented changed everything.
The era when the internet was invented changed everything.
I am looking for a job where I can use my languages.
I am looking for a job where I can use my languages.
The precise moment when the market crashed is still debated.
The precise moment when the market crashed is still debated.
We have reached a stage where further investment is required.
We have reached a stage where further investment is required.
The underlying reason why the policy failed was lack of data.
The underlying reason why the policy failed was lack of data.
This is a case where the law is not entirely clear.
This is a case where the law is not entirely clear.
The epoch when such architectural feats were possible has long passed.
The epoch when such architectural feats were possible has long passed.
One can hardly fathom the reason why such a decision was reached.
One can hardly fathom the reason why such a decision was reached.
The digital landscape is a realm where privacy is increasingly scarce.
The digital landscape is a realm where privacy is increasingly scarce.
There comes a point in every negotiation when silence is the best tool.
There comes a point in every negotiation when silence is the best tool.
間違えやすい
Learners often use 'which' for places without a preposition, or 'where' with a preposition.
In time clauses, 'that' can sometimes replace 'when', but not always.
Learners use 'because' as a relative adverb.
よくある間違い
The house where I live in.
The house where I live.
I like the time which we play.
I like the time when we play.
The reason because I am late.
The reason why I am late.
The city where is big.
The city which is big.
That is the place when I saw him.
That is the place where I saw him.
The day where we met.
The day when we met.
The reason why is because...
The reason is that...
The situation which I found myself.
The situation where I found myself.
The year that I was born in it.
The year when I was born.
The reason why for he left.
The reason why he left.
文型パターン
I remember the time when ___.
This is the place where ___.
The reason why ___ is ___.
We are looking for a situation where ___.
Real World Usage
Could you tell me about a time when you handled a conflict?
Go to the corner where the big bank is.
The city where my heart belongs.
This was an era when social norms were shifting rapidly.
I want to be in a relationship where we trust each other.
The reason why the prime minister resigned is still being debated.
『場所・時・理由』をセットで覚える
The office where I work is very modern.
前置詞のダブりに気をつけて！
The house where I live.(× where I live in とは言いません)
カジュアルなら 'the reason' は省略OK
自然なリズムを盗もう
This is when things started to get interesting.
Smart Tips
Use 'when' to link the date to an event without needing 'in which'.
Immediately swap 'because' for 'why' or 'that'.
Use 'where' to introduce the conditions of that situation.
Drop the 'when' or 'why' entirely after the noun.
発音
Weak form of 'when'
In fast speech, 'when' is often unstressed and sounds like /wən/.
Linking 'where' and 'I'
When 'where' is followed by 'I', the 'r' is often pronounced to link the words (in rhotic and some non-rhotic accents).
Relative Clause Fall
The house where I ↘live...
The pitch usually drops slightly at the end of the relative clause before continuing the main sentence.
暗記しよう
記憶術
Remember the '3 Ws': Where for Space, When for Time, Why for Reason.
視覚的連想
Imagine a map (Where), a clock (When), and a question mark (Why) all connected by bridges to a main building (the Noun).
Rhyme
Where for the place, When for the day, Why for the reason you went away.
Story
I went to a house WHERE I saw a ghost. It was a night WHEN the moon was full. That is the reason WHY I never went back.
Word Web
チャレンジ
Write three sentences about your favorite city using 'where', 'when', and 'why' in under 2 minutes.
文化メモ
Using 'where' for abstract concepts (like 'a relationship where...') is very common in modern therapy and self-help culture.
In formal British academic writing, 'in which' is often preferred over 'where' for non-physical locations.
Sometimes 'where' is used in place of 'that' in very informal regional dialects, though this is non-standard.
Relative adverbs evolved from interrogative adverbs (question words) in Old and Middle English.
会話のきっかけ
Can you describe the house where you grew up?
Is there a specific time of year when you feel most productive?
Tell me about a situation where you had to solve a difficult problem.
What are some reasons why people choose to move to a different country?
日記のテーマ
よくある間違い
Test Yourself
This is the restaurant ___ we celebrated our anniversary.
Find and fix the mistake:
Tuesday is the day where we have our team meeting.
Arrange the words in the correct order:
All words placed
Click words above to build the sentence
Score: /3
練習問題
8 exercisesThat is the restaurant ___ we had our first date.
Find and fix the mistake:
I don't know the reason because he is angry.
There are days ___ I feel like I can achieve anything.
This is the house. I was born in it.
The situation where I am in is very difficult.
In a case ___ the rules are broken, there will be a fine.
A: Why are you so late? B: The reason ___ I'm late is that my car broke down.
never / I / the / when / will / day / forget / we / met
Score: /8
Practice Bank
12 exercisesDo you recall the year ___ we all got new phones?
This is the cafe which I like to read in.
正しい文章を選んでください：
英語に訳してください：『そこは、その映画が撮影された都市です。』
単語を並べ替えて文章を完成させてください：
名詞と正しい関係副詞を組み合わせてください：
She couldn't recall the exact circumstances ___ she made that promise.
Is this the restaurant why you recommended?
正しい関係副詞を使っているのはどれ？
英語に訳してください：『私たちが会った日は火曜日でした。』
並べ替えてください：
節を適切な副詞で繋いでください：
Score: /12
よくある質問 (8)
Yes, in many cases 'that' can replace 'when' in restrictive relative clauses, e.g., 'The day that we met'. However, 'when' is more precise.
No, at a B2 level you should use 'where' for abstract places like 'situations', 'stages', or 'points in a discussion'.
Because 'where' already means 'in which'. Saying 'where... in' is like saying 'in which... in', which is redundant.
It is much less common to omit 'where'. While you can say 'The place I live', it often sounds better to keep 'where'.
'In which' is more formal and used in academic writing. 'Where' is neutral and used in everyday speech.
Yes, but it then becomes a nominal relative clause, e.g., 'Why he left is a mystery.' As a relative adverb, it almost always follows 'reason'.
Yes, but it is archaic. It means 'from where'. You will only see it in old literature or the Bible.
Only if it is a non-defining clause (adding extra info), e.g., 'I live in London, where the weather is often grey.'
Scaffolded Practice
1
2
3
4
Mastery Progress
Needs Practice
Improving
Strong
Mastered
In Other Languages
donde / cuando
Spanish 'donde' can be used with prepositions like 'en donde', whereas English 'where' usually stands alone.
où
French uses one word ('où') for both place and time, while English distinguishes between 'where' and 'when'.
wo / wann
German relative time markers change based on tense, unlike English 'when'.
Relative clause + noun (no adverb)
Japanese has no equivalent to 'where/when/why' connectors; the word order alone does the work.
haythu / 'indama
Arabic relative clauses often repeat the object/place at the end, which is a major error in English.
...de + noun
Chinese uses a single particle 'de' for all relative relationships, regardless of place, time, or person.
Learning Path
Prerequisites
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関係副詞 where, when, why の使い分けを徹底解説
Hapa 英会話
【関係代名詞 vs 関係副詞】もう迷わない！本質的な違い
Atsueigo
関係副詞 where, when, why, how を5分で完璧に理解する！
Hapa 英会話
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