Explanation at your level:
You use 'sudden' in the phrase 'all of a sudden.' It means something happens fast. Example: 'All of a sudden, I saw a cat!' It is a very useful phrase for telling stories.
When you want to say something was a surprise, use 'all of a sudden.' It describes a change that happens in one second. It is common in English conversations.
The noun 'sudden' is essentially a fixed part of the idiom 'all of a sudden.' It functions to indicate an abrupt transition in a narrative. It is helpful for making your storytelling more dynamic and engaging for the listener.
While 'sudden' is primarily an adjective, its noun usage in 'all of a sudden' is a hallmark of natural English fluency. It adds a sense of immediacy to your sentences, allowing you to highlight the unexpected nature of an event.
In advanced usage, 'sudden' as a noun is a linguistic relic. Recognizing that this is a fixed expression rather than a flexible noun helps learners avoid errors like 'a sudden occurrence' (which is correct as an adjective) versus 'the sudden' (which is incorrect). It is best used for narrative pacing.
The noun 'sudden' represents a fascinating case of lexical fossilization. By analyzing its roots in Latin subitaneus, we see how it transitioned from a general noun to a constrained idiomatic component. Mastery involves understanding that while the word is morphologically simple, its syntactic distribution is strictly limited to specific idiomatic clusters in contemporary English.
30秒でわかる単語
- Used in 'all of a sudden'.
- Means unexpected.
- Very common in stories.
- Not a standalone noun.
When we talk about sudden as a noun, we are almost always talking about the phrase all of a sudden. It acts as a placeholder for a 'quick event' or 'unexpected moment.' Imagine you are walking down the street and, all of a sudden, it starts to rain. That moment of change is the 'sudden' we are describing.
It is fascinating because, in English, we usually use 'sudden' as an adjective to describe things, like a 'sudden noise.' Using it as a noun is a grammatical fossil that survives in this one specific idiom. Think of it as a way to emphasize that time just shifted instantly!
The word sudden comes from the Old French word sodain, which traces back to the Latin subitaneus, meaning 'happening secretly' or 'coming on suddenly.' It entered Middle English around the 13th century.
Historically, the noun usage was more flexible, but over centuries, the language streamlined. Most uses of 'sudden' as a standalone noun vanished, leaving behind the fixed phrase all of a sudden. It is a great example of how language preserves old structures through idioms even when the original grammatical rules have shifted.
You will almost exclusively see this word used in the collocation all of a sudden. It is very common in both spoken and written English, appearing in novels, news reports, and casual conversation.
While you might occasionally see archaic phrasing like 'on a sudden,' it sounds very poetic or old-fashioned. Stick to 'all of a sudden' to sound natural. It works perfectly to introduce a plot twist or a change in a story you are telling your friends.
1. All of a sudden: Happening very quickly and unexpectedly. (Example: 'All of a sudden, the lights went out.')
2. On a sudden: An archaic way of saying suddenly. (Example: 'On a sudden, he turned to leave.')
3. Of a sudden: Another old-fashioned variation. (Example: 'Of a sudden, the wind picked up.')
4. Sudden death: A tie-breaking rule in sports. (Example: 'The game went into sudden death overtime.')
5. Sudden impact: A term often used in physics or accident reports. (Example: 'The sudden impact caused the damage.')
In the phrase all of a sudden, 'sudden' acts as a noun following the indefinite article 'a.' It does not have a plural form; you would never say 'all of a suddens.'
The pronunciation is /ˈsʌd.ən/ in both British and American English. The stress is on the first syllable. It rhymes with words like muddied (loosely), budden (non-standard), and glutton (in terms of the 'un' sound).
Fun Fact
It evolved from the Latin 'subitaneus', which meant 'coming on secretly'.
Pronunciation Guide
Clear 'u' sound, then 'd', 'un'.
Similar to UK, slightly more nasal 'u'.
Common Errors
- Pronouncing the 'd' too softly
- Adding an extra syllable
- Misplacing the stress
Rhymes With
Difficulty Rating
Easy
Medium
Easy
Easy
What to Learn Next
Prerequisites
Learn Next
上級
Grammar to Know
Idiomatic Expressions
All of a sudden
Adverb vs Adjective
Sudden vs suddenly
Article Usage
A vs The
Examples by Level
All of a sudden, it rained.
Suddenly, rain started.
Fixed phrase.
All of a sudden, he ran.
He ran fast.
Idiom.
All of a sudden, I was happy.
I felt happy fast.
Idiom.
All of a sudden, the dog barked.
Dog barked fast.
Idiom.
All of a sudden, the bus came.
The bus arrived.
Idiom.
All of a sudden, she laughed.
She started laughing.
Idiom.
All of a sudden, it was dark.
Night came fast.
Idiom.
All of a sudden, I saw you.
I spotted you.
Idiom.
All of a sudden, the phone rang.
All of a sudden, the movie ended.
All of a sudden, we were lost.
All of a sudden, the wind blew.
All of a sudden, I felt cold.
All of a sudden, the door opened.
All of a sudden, he left.
All of a sudden, the music stopped.
All of a sudden, the atmosphere in the room changed.
She was reading when, all of a sudden, the power failed.
All of a sudden, he realized he had forgotten his keys.
The calm was broken, all of a sudden, by a loud crash.
All of a sudden, the train accelerated.
I was thinking about home when, all of a sudden, I felt homesick.
All of a sudden, the sky turned grey.
All of a sudden, they decided to move.
All of a sudden, the entire project was cancelled.
He was mid-sentence when, all of a sudden, he stopped talking.
All of a sudden, the stock market plummeted.
The silence was, all of a sudden, shattered by a scream.
All of a sudden, the opportunity presented itself.
All of a sudden, the plan seemed foolish.
All of a sudden, the crowd surged forward.
All of a sudden, her confidence returned.
All of a sudden, the narrative took a dark turn.
The realization hit him, all of a sudden, like a physical blow.
All of a sudden, the geopolitical landscape shifted.
It was, all of a sudden, clear that we had failed.
All of a sudden, the abstract became concrete.
All of a sudden, the tension reached a breaking point.
All of a sudden, the truth was laid bare.
All of a sudden, the complexity of the issue became apparent.
All of a sudden, the long-standing tradition was abandoned.
The paradigm shifted, all of a sudden, to something entirely new.
All of a sudden, the existential dread vanished.
It happened, all of a sudden, with the force of a revelation.
All of a sudden, the discourse became heated.
All of a sudden, the intricate design collapsed.
All of a sudden, the philosophical debate reached an impasse.
All of a sudden, the quietude was replaced by chaos.
類義語
反対語
よく使う組み合わせ
Idioms & Expressions
"All of a sudden"
Happening without warning.
All of a sudden, the bell rang.
neutral"On a sudden"
Archaic for suddenly.
He stood on a sudden.
literary"Of a sudden"
Archaic for suddenly.
Of a sudden, he was gone.
literary"Sudden death"
A tie-breaker.
The match went to sudden death.
neutral"Sudden impact"
Collision force.
The sudden impact was severe.
neutral"Sudden turn of events"
Unexpected change.
It was a sudden turn of events.
neutralEasily Confused
It is the adverb form.
Use 'suddenly' for actions, 'all of a sudden' for events.
He ran suddenly / All of a sudden, he ran.
Similar meaning.
Abrupt is an adjective.
An abrupt stop.
Similar speed.
Quick describes speed, sudden describes surprise.
A quick run vs a sudden noise.
Similar meaning.
Unexpected is an adjective.
An unexpected guest.
Sentence Patterns
All of a sudden + [comma] + [sentence]
All of a sudden, I left.
[Sentence] + all of a sudden + [sentence]
I was eating, all of a sudden, I stopped.
It happened all of a sudden.
The crash happened all of a sudden.
語族
Nouns
Adjectives
関連
How to Use It
9/10
Formality Scale
よくある間違い
Sudden is not a standalone noun.
Missing the article 'a'.
Sudden requires a noun.
Wrong article.
Use the adverb.
Tips
The Golden Rule
Always keep it in the phrase 'all of a sudden'.
Don't Pluralize
Never add an 's'.
Narrative Practice
Use it when telling stories to friends.
Article Check
Always use 'a', not 'the'.
Stress the First
SUD-den.
Storytelling
It adds drama to your tales.
Latin Roots
It comes from 'subitaneus'.
Visuals
Imagine a surprise pop-up.
Read Aloud
Say the phrase 10 times.
Adjective vs Noun
Remember it's mostly an adjective.
Memorize It
Mnemonic
S-U-D-D-E-N: Super Unexpectedly, Doing Does Everything Now.
Visual Association
A jack-in-the-box popping up.
Word Web
チャレンジ
Write 3 sentences using 'all of a sudden'.
語源
Latin
Original meaning: Coming on secretly/unexpectedly.
文化的な背景
None.
Used frequently in storytelling to create suspense.
Practice in Real Life
Real-World Contexts
Storytelling
- All of a sudden
- I didn't expect it
- Out of nowhere
Accidents
- All of a sudden
- Sudden impact
- Without warning
Weather
- All of a sudden
- The rain started
- The wind changed
Surprises
- All of a sudden
- A big surprise
- It appeared
Conversation Starters
"Tell me about a time when, all of a sudden, something happened."
"What do you do when, all of a sudden, you are bored?"
"Have you ever, all of a sudden, changed your mind?"
"What is the most, all of a sudden, surprising thing you've seen?"
"Do you like it when things happen, all of a sudden?"
Journal Prompts
Write about a day where, all of a sudden, the weather changed.
Describe a moment when, all of a sudden, you realized something important.
What happens when, all of a sudden, you lose your keys?
Write a story starting with 'All of a sudden...'
よくある質問
8 問Only in the phrase 'all of a sudden'.
Yes, primarily.
No.
It is neutral.
Yes, as an adjective.
It is a historical idiom.
Used in both.
It is common but technically 'all of a sudden' is standard.
自分をテスト
All of a ___ , it rained.
The phrase is 'all of a sudden'.
What does 'all of a sudden' mean?
It means something happens fast/unexpectedly.
Can you say 'I saw a sudden'?
Sudden is not a noun on its own.
Word
意味
They are synonyms.
Correct order is 'all of a sudden'.
スコア： /5
Summary
Always use 'sudden' as a noun within the fixed phrase 'all of a sudden' to describe a fast, unexpected event.
- Used in 'all of a sudden'.
- Means unexpected.
- Very common in stories.
- Not a standalone noun.
The Golden Rule
Always keep it in the phrase 'all of a sudden'.
Don't Pluralize
Never add an 's'.
Narrative Practice
Use it when telling stories to friends.
Article Check
Always use 'a', not 'the'.
例文
All of a sudden, the lights went out during the party.
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