Grammar Rule in 30 Seconds
Use `don't` or `doesn't` before a verb to say that an action does not happen.
- Use `don't` for `I`, `you`, `we`, and `they`. Example: `I don't like coffee.`
- Use `doesn't` for `he`, `she`, and `it`. Example: `She doesn't like tea.`
- When using `doesn't`, the main verb loses its `s`. Example: `He doesn't eat` (not `eats`).
Overview
don'tとdoesn'tのどちらを使うか迷ったことはありますか？あなただけではありません。これは英語を学ぶ人にとって最初のパズルの1つです。don'tとdoesn'tは、行動について「いいえ」と言う最も簡単な方法だと考えてください。これらは現在時制で否定文を作るためのあなたの頼りになる言葉です。たとえば、「I not like spicy food」と言う代わりに、「I don't like spicy food」と言います。その方がずっと自然に聞こえます。この小さな変化が、あなたの英語がどれだけ明確に聞こえるかに大きな違いをもたらします。これら2つの単語はまったく同じ仕事をしますが、友達を選ぶのがうるさいのです。don'tは一部の主語と付き合い、doesn'tは他の主語と付き合います。これを正しく理解することは大きな一歩です。それは基本的な英文法の秘密の握手を学ぶようなものです。一度ルールを知ってしまえば、歌やNetflix、そしてあなた自身の会話の中で、どこでも耳にするようになります。見た目ほど怖くはありません、約束します。これを終える頃には、あなたは生まれつきのようにdon'tとdoesn'tを使いこなしているでしょう。そうではないかもしれませんが、かなり上手になっているはずです。How This Grammar Works
he、she、itが含まれます。また、my brother、the cat、the companyのように、単一の人物、場所、物も含まれます。これらの主語のいずれかがある場合、動詞は通常、語尾に-sが付きます。たとえば、「He plays guitar」。しかし、これを否定形にすると、その-sは主動詞から助動詞doに移動します。したがって、doはdoesになり、それにnotを追加します。Does notはくっついてdoesn'tになります。主動詞は元の基本形に戻ります。なので、「He doesn't play guitar」。playにはもう-sが付いていないことに注意してください。他のすべての主語—I、you、we、they、そしてmy parentsやdogsのような複数形の名詞—については、do notを使い、これはdon'tになります。主動詞は基本形のままです。たとえば、「They don't play guitar」。動詞playには元々-sが付いていなかったので、そのままです。これがすべての秘密です！コツは、どの主語がdoesn'tクラブに属しているかを覚えておくだけです。
Formation Pattern
I、my friend、the dogs）。
I、you、we、they（または複数名詞）の場合は、don'tを使用します。主語がhe、she、it（または単数名詞）の場合は、doesn'tを使用します。
eat、sleep、work、studyのような行動の言葉です。非常に重要：動詞は単純で元のバージョンでなければなりません。-s、-ing、-edは付けません。ただの動詞です。
sushi、late、at home、on weekendsのような目的語や場所など、他の詳細を追加します。
I → 助動詞：don't → 動詞：speak → 詳細：French。結果：「I don't speak French.」
She → 助動詞：doesn't → 動詞：speak → 詳細：French。結果：「She doesn't speak French.」
My cats (複数) → 助動詞：don't → 動詞：like → 詳細：water。結果：「My cats don't like water.」
My cat (単数) → 助動詞：doesn't → 動詞：like → 詳細：water。結果：「My cat doesn't like water.」
When To Use It
don'tとdoesn'tがあなたの親友になる特定の状況を見てみましょう。- 事実や一般的な真理を述べる： 一般的に真実ではないことを言うために使用します。「The earth
doesn'trevolve around the moon.」またはより個人的なレベルで、「Idon'twork on Sundays.」 - 習慣や日課について話す： あなた（または他の人）が定期的に行わない行動を説明するため。「She
doesn'tdrink coffee.」または「Wedon'twatch TV in the morning.」 - 好き嫌いを表現する： これは大きなものです。あなたの好みについて話すときにいつも使います。「He
doesn'tlike horror movies.」または「Theydon'tenjoy crowded places.」 - 「はい/いいえ」の質問に答える： 誰かがあなたに「Do you...?」または「Does he...?」という質問をしたとき、
don'tとdoesn'tは短い否定の答えに最適です。「Do you live here?」「No, Idon't.」「Does your phone have a good camera?」「No, itdoesn't.」 - 丁寧な断り方をする： 「いいえ」と言うためのより穏やかな方法です。友達が何かを勧めてくれたとき、「Thanks, but I
don'teat meat」と言うことができます。ただ「No meat!」と言うよりずっと丁寧です。あなたが原始人でない限り、その場合は続けてください。
Common Mistakes
- 1誰にでも
don'tを使う： 最も一般的な間違いは、he、she、またはitでdon'tを使うことです。
- ✗
He don't live here. - ✓
He doesn't live here.
- 1
doesn'tと一緒に主動詞に-sを追加する：doesn'tはすでに-sの力を持っていることを忘れないでください。主動詞は基本形でなければなりません。
- ✗
She doesn't likes pizza. - ✓
She doesn't like pizza.
- 1
no或いはnotを単独で使う： これは他のいくつかの言語からの直訳です。英語では、助動詞doが必要です。
- ✗
I not understand. - ✓
I don't understand. - ✗
He no want to go. - ✓
He doesn't want to go.
- 1単数/複数の名詞を混同する： 名詞が単数か複数かを忘れると、つまずくことがあります。
- ✗
My friend don't have a car.(一人の友達は単数) - ✓
My friend doesn't have a car. - ✗
The people doesn't seem happy.(peopleは複数) - ✓
The people don't seem happy.
Contrast With Similar Patterns
Don'tとdoesn'tは現在のためですが、過去や未来についてはどうでしょうか？またはto beのような動詞については？それをはっきりさせましょう。Don't/Doesn'tvs.Didn't:Don'tとdoesn'tは今（現在時制）のためです。Didn'tは以前（過去時制）のためです。Didn'tはすべての主語に使われるので簡単です。単数か複数かを心配する必要はありません。- 現在：「I
don'tgo to the gym today.」 - 過去：「I
didn'tgo to the gym yesterday.」 - 現在：「He
doesn'tcheck his email.」 - 過去：「He
didn'tcheck his email this morning.」
Don't/Doesn'tvs.Aren't/Isn't: これは大きなポイントです。Don'tとdoesn'tは行動（run、eat、thinkなどの動詞）に使います。Aren'tとisn'tは説明、状態、またはアイデンティティ（動詞to beを使用）に使います。それらを混ぜることはできません。- 行動：「She
doesn'twork here.」（行動はwork） - 状態：「She
isn'tthe manager.」（状態はbethe manager） - 行動：「They
don'tlike the movie.」（行動はlike） - 説明：「They
aren'thappy.」（説明はhappy）
Don't/Doesn'tvs.Won't:Won'tは未来のためです。これはwillの否定形です。didn'tと同様に、won'tはすべての主語に使われます。- 現在：「We
don'thave time now.」 - 未来：「We
won'thave time tomorrow.」
Quick FAQ
don'tとdoesn'tの代わりにdo notとdoes notを使えますか？
はい！do notとdoes notは完全な形です。それらはよりフォーマルで、文章や強調のためにしばしば使われます。don'tとdoesn'tは短縮形で、日常会話でははるかに一般的です。
質問についてはどうですか？
良い質問です！否定疑問文の場合、文頭にDon'tまたはDoesn'tを置くだけです。「Don't you want to come?」や「Doesn't he know the address?」。少し上級ですが、同じ主語のルールに従います。
ain'tは本当の言葉ですか？使えますか？
一部の音楽や非常にインフォーマルなスピーチでain'tを耳にすることがあります。これはam not、is not、are not、has not、have notの非標準的な短縮形です。ほとんどの状況、特に文章やプロの場では使用を避けるのが最善です。今のところはdon'tとdoesn'tに固執してください。その方が賢く聞こえます、約束します。
主語がGoogleのような会社名の場合はどうなりますか？
単一の会社はitとして扱われます。したがって、doesn'tを使用します。「Google doesn't have an office in my city.」バンドについても同じです：「Coldplay doesn't play here often.」
2. Present Simple Negative Conjugation
| Subject | Auxiliary (Negative) | Verb (Base Form) | Example |
|---|---|---|---|
|
I
|
don't
|
work
|
I don't work.
|
|
You
|
don't
|
work
|
You don't work.
|
|
He
|
doesn't
|
work
|
He doesn't work.
|
|
She
|
doesn't
|
work
|
She doesn't work.
|
|
It
|
doesn't
|
work
|
It doesn't work.
|
|
We
|
don't
|
work
|
We don't work.
|
|
They
|
don't
|
work
|
They don't work.
|
Contractions vs. Full Forms
| Full Form | Contraction | Usage |
|---|---|---|
|
do not
|
don't
|
Common in speech and informal writing
|
|
does not
|
doesn't
|
Common in speech and informal writing
|
Meanings
The primary way to express that a general fact, habit, or preference is not true in the present tense.
Habits and Routines
To describe actions that someone does not regularly perform.
“They don't wake up early.”
“He doesn't smoke.”
General Truths and Facts
To state things that are universally or currently untrue.
“The sun doesn't go around the Earth.”
“It doesn't rain much in the desert.”
Preferences and Likes
To express things that a person does not enjoy or want.
“I don't like spicy food.”
“She doesn't want a new car.”
Reference Table
| 主語 | 否定の形 | 例文 |
|---|---|---|
|
I
|
don't
|
I don't understand.
|
|
You
|
don't
|
You don't listen.
|
|
We
|
don't
|
We don't need help.
|
|
They
|
don't
|
They don't live here.
|
|
He
|
doesn't
|
He doesn't speak French.
|
|
She
|
doesn't
|
She doesn't like coffee.
|
|
It
|
doesn't
|
It doesn't work.
|
フォーマル度スペクトル
He does not reside at this address. (Address verification)
He doesn't live here. (Address verification)
He's not here. (Address verification)
He don't live here no more. (Address verification)
Don't & Doesn't: 否定文のパワーアップ
Don't を使う場合:
- I I don't understand.
- You You don't listen.
- We We don't live here.
- They They don't know.
Doesn't を使う場合:
- He He doesn't work.
- She She doesn't like it.
- It It doesn't matter.
大事なルール:
- もとの形の動詞 Always use the verb's base form after don't/doesn't.
- -S は消える The '-s' for he/she/it moves to 'do' making 'does'.
Don't vs. Doesn't: どっちを使う？
Don't か Doesn't を選ぶガイド
主語は I, You, We, They（または複数）ですか？
主語は He, She, It（または単数）ですか？
どんな場面で使う？
日常会話
- • 'I don't understand.'
- • 'She doesn't like that.'
- • 'We don't eat out much.'
仕事や学校
- • 'The system doesn't work.'
- • 'He doesn't have the report.'
- • 'They don't come on Fridays.'
好み・趣味
- • 'I don't like scary movies.'
- • 'He doesn't drink coffee.'
- • 'It doesn't matter to me.'
レベル別の例文
I don't like milk.
You don't have a car.
She doesn't speak English.
We don't live here.
He doesn't go to school on Saturdays.
It doesn't cost much money.
They don't usually eat meat.
My dog doesn't bark at night.
I do not believe that is the correct answer.
She doesn't seem to understand the problem.
We don't need to finish this today, do we?
It doesn't matter what they think.
The company doesn't provide health insurance for part-time staff.
He doesn't necessarily want to move to another city.
This theory doesn't account for recent discoveries.
I don't recall seeing him at the conference.
Rarely does he not finish his work on time.
I don't suppose you could lend me a hand?
It doesn't follow that he is guilty just because he was there.
She doesn't half talk a lot!
He don't know nothing about it.
The evidence doesn't so much prove his guilt as suggest his involvement.
One doesn't simply walk into Mordor.
The law doesn't differentiate between the two types of offenses.
間違えやすい
Learners often use 'no' as a universal negative.
Mixing up action verbs and adjectives.
Using 'haven't' for general possession in American English.
よくある間違い
I no like coffee.
I don't like coffee.
She not work here.
She doesn't work here.
He don't like tea.
He doesn't like tea.
I am not play football.
I don't play football.
She doesn't likes pizza.
She doesn't like pizza.
They doesn't have a car.
They don't have a car.
It don't rain often.
It doesn't rain often.
I don't never go there.
I never go there. / I don't ever go there.
I don't think he is not coming.
I don't think he is coming.
文型パターン
I don't ___.
She doesn't ___ very often.
It doesn't ___ like it's going to rain.
They don't necessarily ___ that.
Real World Usage
I don't know yet, I'll tell u later.
I do not have experience in coding, but I learn fast.
I don't want onions on my burger, please.
She doesn't even follow me back lol.
This bus doesn't go to the airport.
It doesn't hurt when I press here.
「S」のルールを思い出して！
doesn't を選びましょう。それ以外は don't でOKです。 "He doesn't eat meat."動詞は「もとの形」が鉄則！
短縮形がナチュラル！
don't や doesn't を使うのが一番自然でこなれて聞こえますよ。 "I don't know him."丁寧に断るコツ
リズムを感じてみて
Smart Tips
Check for the 'Double S'. If you have 'doesn't', remove the 's' from the next word.
Separate the contraction into two words.
Delete one of them. English hates double negatives.
Always use 'have', never 'has'.
発音
The 't' in Don't
In fast speech, the 't' at the end of 'don't' is often silent (a stop).
Doesn't reduction
The 'oe' is a short 'u' sound, and the 't' is often dropped before a consonant.
Emphatic Negation
I DO NOT like it.
Stressing 'not' shows strong anger or disagreement.
暗記しよう
記憶術
He, She, and It are the 'S-Club'. They always want the 'S' in 'Does'.
視覚的連想
Imagine a superhero named 'Captain Does' who flies into a sentence and steals the 'S' from the main verb to put it on his own name.
Rhyme
I, you, we, they—don't is the way. He, she, it—doesn't is the fit.
Story
Once there was a verb named 'Likes' who lived with 'She'. They were happy. But then 'Doesn't' moved in. 'Doesn't' was very bossy and told 'Likes' to drop the 'S' because there wasn't enough room in the house for two 'S' sounds.
Word Web
チャレンジ
Write down 5 things you don't do on your birthday.
文化メモ
In some dialects like AAVE, 'he don't' is used consistently as a marker of identity, though it is not used in formal business English.
In some Northern English dialects, 'do not' might be shortened differently in regional speech, but 'don't' remains the standard.
Using the full 'do not' is preferred in legal contracts to avoid any ambiguity that a contraction might cause.
The use of 'do' as an auxiliary verb (do-support) began to appear in English around the 1300s.
会話のきっかけ
What is a food you don't like?
Tell me something your best friend doesn't do.
What are some things you don't usually do on weekends?
What is a rule in your country that people don't always follow?
日記のテーマ
よくある間違い
Test Yourself
Score: /4
練習問題
8 exercisesI ___ like cold weather.
Which sentence is correct?
Find and fix the mistake:
They doesn't live in London.
She works on Sundays.
1. We, 2. It, 3. You
A: Does your brother play guitar? B: No, he ___.
not / they / coffee / drink / do
The sun ___.
Score: /8
Practice Bank
12 exercisesI ___ play sports.
The computer ___ turn on.
They doesn't speak Italian.
She don't likes coffee.
正しい文章を選んでください：
正しい文章を選んでください：
「私たちは十分な牛乳を持っていません」を英語にしましょう。
「彼はそのジョークを理解していません」を英語にしましょう。
単語を並べ替えて文章を作ってください：
単語を並べ替えて文章を作ってください：
主語と正しい否定の形を組み合わせてください：
主語と正しい否定の形を組み合わせてください：
Score: /12
よくある質問 (8)
English verbs (except 'be' and modals) cannot carry negation on their own. We need the 'helper' verb `do` to hold the word `not`.
In standard English, no. It should be `He doesn't`. However, you will hear `He don't` in some songs and dialects.
`Don't` is a contraction used in speaking. `Do not` is the full form used for formal writing or for strong emphasis.
Never. When `doesn't` is present, the main verb is always in its base form (e.g., `He doesn't go`, not `He doesn't goes`).
No. `I am not` is for descriptions. `I don't` is for actions. You cannot say `I don't am`.
It sounds like 'DUZ-ent'. The 't' at the end is often very soft or silent.
No, it is for anything singular that isn't 'I' or 'You'. For example: `The car doesn't start.`
Since 'Tom and Jerry' is 'They', you use `don't`. Example: `Tom and Jerry don't like each other.`
Scaffolded Practice
1
2
3
4
Mastery Progress
Needs Practice
Improving
Strong
Mastered
In Other Languages
No + Verb
Spanish has no auxiliary 'do' for negation.
Ne + Verb + Pas
French negates the verb directly with two particles.
Verb + Nicht
The negative word comes after the verb in German.
Verb-nai / Verb-masen
Negation is a suffix/conjugation of the verb itself.
La / Ma + Verb
Simple particle placement before the verb.
Bù / Méi + Verb
No verb conjugation or auxiliary support.
Learning Path
Prerequisites
Connected Grammar
Present Simple Affirmative
PrerequisiteYou must know how to form positive sentences before making them negative.
Do-Support in Questions
Builds OnQuestions use the same 'do/does' helpers as negation.
Verb 'To Be' Negation
ContrastLearners often confuse 'don't' with 'am not/isn't'.
Past Simple Negation (Didn't)
Advanced FormOnce you master 'don't', 'didn't' is the next logical step for the past tense.
