Explanation at your level:
Use isn't when you want to say 'no'. If you say 'The cat is not big,' you can say 'The cat isn't big.' It is very easy! Use it with 'he', 'she', and 'it'.
You use isn't to describe things that are not true. For example, 'The store isn't open today.' It is a very common word that makes your English sound more natural when you speak with friends.
In intermediate English, isn't is essential for negative statements. You will find it in tag questions too, like 'It isn't raining, is it?' It helps you sound like a fluent speaker rather than a textbook.
At this level, you should notice the register. While isn't is perfect for conversation, you should avoid it in formal essays or academic reports where 'is not' is preferred for clarity and tone.
The use of isn't can sometimes be used for rhetorical effect. In speeches or persuasive writing, using a contraction can make the speaker seem more relatable and grounded, bridging the gap between the audience and the message.
Mastery of isn't involves understanding its role in the rhythm of English. Native speakers use it to maintain a specific cadence in speech. Using it correctly shows you have moved beyond basic grammar and understand the nuances of informal versus formal registers in literature and media.
30秒でわかる単語
- Short for 'is not'.
- Use for third person singular.
- Informal register.
- Essential for natural speech.
Hey there! Isn't is one of the most useful tools in your English toolkit. It is a contraction, which is just a fancy way of saying we squished two words—'is' and 'not'—into one to make talking faster and smoother.
Think of it as a shortcut. Instead of saying, 'The cake is not ready,' you can simply say, 'The cake isn't ready.' It sounds much more natural in everyday conversation. Just remember that it is almost exclusively used for the third person singular, which means we use it with 'he,' 'she,' 'it,' or singular nouns like 'the dog' or 'the car.'
The history of isn't is tied to the evolution of the English language's love for efficiency. Contractions started appearing in writing as early as the 16th century, though they were often frowned upon by strict grammarians who preferred the full 'is not.'
The word 'is' comes from the Old English 'is,' which traces back to the Proto-Indo-European root *es-. When we added 'not' (from the Old English 'noht'), we eventually started dropping the 'o' and replacing it with an apostrophe to show where the letter went missing. It is a classic example of how English speakers have spent centuries trying to make speech more fluid and less clunky.
You will hear isn't everywhere in daily life. It is the go-to choice for casual chats, text messages, and informal emails. Because it sounds friendly and relaxed, it is perfect for talking to friends or family.
However, be careful in formal writing. If you are writing a research paper, a legal document, or a very professional cover letter, teachers and editors often prefer the full form 'is not' to keep things sounding serious and precise. It is all about knowing your audience!
While 'isn't' is a grammar tool, it appears in many common phrases.
- Isn't that something? (Used to express surprise).
- It isn't the end of the world. (Meaning a situation isn't as bad as it seems).
- Isn't life funny? (Reflecting on unexpected events).
- That isn't my cup of tea. (Meaning you don't like something).
- Isn't it time we left? (A polite way to suggest leaving).
Grammatically, isn't acts as a negative verb. It follows the subject: 'She isn't happy.' In British English, it is pronounced with a clear 'z' sound, while in American English, the 't' at the end is often softened or turned into a 'flap' sound.
It rhymes with 'dizzy' (if you ignore the final 't') or 'isn't' itself. Remember: never use 'isn't' with 'I' (use 'I'm not') or 'you/we/they' (use 'aren't'). It is strictly for singular subjects like 'he,' 'she,' or 'it.'
Fun Fact
The apostrophe represents the missing letter 'o'.
Pronunciation Guide
Clear 'z' sound with a short 'i' vowel.
The 't' at the end is often unreleased or a stop.
Common Errors
- Pronouncing the 's' like an 'sh'
- Adding an extra syllable
- Confusing with 'aren't'
Rhymes With
Difficulty Rating
Easy
Easy
Easy
Easy
What to Learn Next
Prerequisites
Learn Next
上級
Grammar to Know
Contractions
is + not = isn't
Third Person Singular
He is
Negative Sentences
He is not
Examples by Level
She isn't here.
She is not here.
Third person singular.
It isn't cold.
It is not cold.
Weather description.
He isn't my brother.
He is not my brother.
Identity.
The car isn't new.
The car is not new.
Adjective.
The book isn't long.
The book is not long.
Size.
Today isn't Monday.
Today is not Monday.
Time.
The dog isn't hungry.
The dog is not hungry.
State.
This isn't my pen.
This is not my pen.
Possession.
It isn't easy to learn a new language.
The coffee isn't hot enough.
She isn't feeling very well today.
The movie isn't as good as the book.
He isn't going to the party.
This isn't the right way to the station.
The house isn't very big, but it's cozy.
It isn't fair to blame him.
It isn't just about money; it's about time.
He isn't exactly known for his punctuality.
The reason isn't clear to anyone yet.
Isn't it funny how things change?
She isn't interested in that kind of music.
The project isn't finished, so don't leave yet.
It isn't worth the effort.
Isn't that the person we met last week?
It isn't merely a suggestion; it is a requirement.
The evidence isn't sufficient to prove his guilt.
Isn't it fascinating how language evolves?
She isn't prone to making such mistakes.
The outcome isn't what we had anticipated.
It isn't surprising that they succeeded.
Isn't it time we addressed the elephant in the room?
The policy isn't strictly enforced.
The discrepancy isn't negligible in this context.
It isn't an understatement to say the situation is dire.
Isn't it ironic that the expert failed the test?
The hypothesis isn't supported by the data.
It isn't inconceivable that they might win.
The nuance isn't lost on the audience.
Isn't it prudent to consider all alternatives?
The complexity isn't a barrier to understanding.
The philosophical implications aren't easily dismissed.
It isn't within the scope of this inquiry.
Isn't the pursuit of truth the ultimate goal?
The aesthetic isn't to everyone's taste.
It isn't an exaggeration to call this a masterpiece.
The subtle irony isn't lost on the reader.
Isn't it profound how silence speaks volumes?
The methodology isn't inherently flawed.
よく使う組み合わせ
Idioms & Expressions
"Isn't that the pot calling the kettle black?"
Someone criticizing others for a fault they have themselves.
He called me lazy? Isn't that the pot calling the kettle black?
casual"It isn't my cup of tea."
It is not something I like.
Opera isn't my cup of tea.
casual"Isn't it a small world?"
Used when meeting someone unexpectedly.
You know my cousin? Isn't it a small world?
casual"Isn't it the truth?"
Agreeing strongly with a statement.
Life is hard, isn't it the truth?
casual"Isn't that something?"
Expressing surprise or wonder.
She finished the race in record time. Isn't that something?
casual"Isn't it time?"
A prompt to take action.
Isn't it time we started working?
neutralEasily Confused
Both are negative contractions.
Aren't is for plural.
They aren't here.
Both are contractions.
Wasn't is past tense.
He wasn't there.
Both are contractions.
Hasn't is for possession/perfect tense.
He hasn't eaten.
Both are negative.
Ain't is non-standard slang.
I ain't going.
Sentence Patterns
Subject + isn't + adj
He isn't tall.
Subject + isn't + noun
It isn't a cat.
Isn't + subject + adj?
Isn't he happy?
Subject + isn't + -ing
She isn't working.
It isn't + adj + to + verb
It isn't easy to run.
語族
Verbs
関連
How to Use It
10
Formality Scale
よくある間違い
Contractions must match the subject.
Use 'aren't' for plural subjects.
Grammar structure requires a participle.
Avoid double negatives.
Formal writing avoids contractions.
Tips
The Hook Trick
Think of the apostrophe as a hook catching the 'o'.
Casual vs Formal
Save 'is not' for your boss.
Native Flow
Native speakers love contractions.
Singular Only
He, She, It only!
Soft T
Don't over-pronounce the T.
No Double Negatives
Don't say 'isn't no'.
Did You Know?
It's one of the first contractions kids learn.
Listen for it
Listen to songs for 'isn't'.
Memorize It
Mnemonic
IS + NOT = ISN'T (Drop the O, add the hook!)
Visual Association
A 'no' sign over the word 'IS'.
Word Web
チャレンジ
Try to say 5 sentences with 'isn't' today.
語源
English
Original meaning: Combination of 'is' and 'not'.
文化的な背景
None.
Used in every English-speaking country as a standard contraction.
Practice in Real Life
Real-World Contexts
Daily life
- Isn't it cold?
- It isn't working.
- That isn't right.
At work
- The report isn't ready.
- It isn't my fault.
- That isn't the plan.
School
- The class isn't over.
- It isn't a hard test.
- That isn't the answer.
Travel
- The bus isn't here.
- It isn't far.
- The room isn't clean.
Conversation Starters
"Isn't the weather nice today?"
"Isn't it time for lunch?"
"Isn't that a beautiful view?"
"Isn't life interesting?"
"Isn't it funny how we met?"
Journal Prompts
Write about something that isn't working.
Describe a place that isn't your home.
What isn't fair in the world?
List things that isn't true about you.
よくある質問
8 問No, use 'I'm not'.
No, it is informal.
It replaces the missing 'o'.
No, use 'aren't'.
To speak faster.
Yes, in casual writing.
IZ-unt.
No, it is a verb.
自分をテスト
The dog ___ hungry.
Dog is singular.
Which is correct?
Isn't is for third person singular.
You can use 'isn't' in formal essays.
Formal writing prefers 'is not'.
Word
意味
Matches usage.
Isn't it the truth?
スコア： /5
Summary
Isn't is the perfect way to make 'is not' sound friendly and fast in casual conversation.
- Short for 'is not'.
- Use for third person singular.
- Informal register.
- Essential for natural speech.
The Hook Trick
Think of the apostrophe as a hook catching the 'o'.
Casual vs Formal
Save 'is not' for your boss.
Native Flow
Native speakers love contractions.
Singular Only
He, She, It only!
例文
He isn't coming to the party tonight.
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