Grammar Rule in 30 Seconds
Use 'didn't' plus the base verb to say something didn't happen in the past. Never add -ed to the main verb!
- Use 'didn't' for all subjects (I, you, he, she, it, we, they). Example: 'I didn't go.'
- The main verb stays in its base form. Example: 'She didn't eat' (NOT 'didn't ate').
- The verb 'to be' is the only exception; it uses 'wasn't' or 'weren't' instead.
Overview
Past Simple の否定形は最高の味方だよ。実はこれ、物事をよりシンプルにしてくれる文法ルールの一つなんだ。まあ、ほとんどの場合はね！Past Simple の否定形は、過去のことに対して「ノー」と言うための方法だよ。英語では、他の言語みたいにメインの動詞に not を付けるだけじゃないんだ。「I wented not」とか「I not went」とは言えない。そんな風に言うと、中世の騎士みたいに聞こえちゃうよ（それはそれでかっこいいけど、就職面接には向かないかもね）。代わりに、do-support（doサポート）と呼ばれる特別な助っ人の動詞を使うんだ。過去形の場合、その助っ人は did になるよ。文章を否定形にしたい時は、did not（あるいはもっと一般的な短縮形の didn't）を登場させる。did のすごいところは、過去形という重荷を全部引き受けてくれるから、メインの動詞は一番シンプルな形のままでいいってこと。did は文章の指定運転手みたいなものかな。自分はシラフ（過去形）のままでいてくれるから、メインの動詞は後部座席でリラックスしていられるんだ。How This Grammar Works
did という単語を、強力な磁石だと考えてみて。肯定文では、過去形はメインの動詞の中に隠れているよね（例：walked、ate、saw）。でも、否定形にしたいと思った瞬間に did 現れて、メインの動詞からその「過去っぽさ」を全部吸い取っちゃうんだ。did が過去形を奪い取ると、メインの動詞は 原形（base form）に戻る。だから「I didn't went」じゃなくて「I didn't go」って言うんだ。went は自分の過去形のパワーを did に譲り渡すってわけ。これって実は、君にとってすごくラッキーなニュースなんだよ！なぜかって？否定文で話す時は、あのややこしい不規則動詞の過去形を気にしなくて済むからね。動詞が規則動詞（finish -> finished）でも不規則動詞（go -> went）でも、否定形はいつも 原形 の動詞を使うんだ。究極の文法ライフハックだよね。覚えておいて：did がボスで、ボスがいる時はメインの動詞は働かなくていいんだ。
Formation Pattern
I、you、he、she、it、we、they のどれでも同じだよ。誰が話しているかによって 's' を付けたり語尾を変えたりする心配はもういらない！
did not）を加える。
-ed を付けたり、不規則な変化をさせたりしない形）を加える。
to be 動詞（be動詞）はちょっとした反逆児なんだ。助っ人を呼ぶのが嫌いで、did を使わない。代わりに、過去形の was と were にそのまま not を付けるだけ。
I wasn't (I was not)
You weren't (You were not)
He/She/It wasn't (He/She/It was not)
We/They weren't (We/They were not)
When To Use It
- 欠席や不在の理由を説明する: 「疲れていたからパーティーに行かなかったんだ（I didn't come to the party because I was tired.）」
- 情報を訂正する: 「いや、WhatsAppのグループでそんなこと言ってないよ（No, I didn't say that in the WhatsApp group.）」
- 変わってしまった習慣を説明する: 「以前は寿司が好きじゃなかったけど、今は大好き！（I didn't use to like sushi, but now I love it!）」（注：過去の習慣には
didn't use toを使うよ） - レビューをする: 「映画はまあまあだったけど、結末は好きじゃなかったな（The movie was okay, but I didn't like the ending.）」
- SNSで: 「昨日はネットから離れてたから、ストーリーを投稿しなかったんだ（I didn't post any stories yesterday because I was off the grid.）」
Common Mistakes
- 1The Double Past（二重過去）: これが一番多いミスだよ。「I didn't went」とか「He didn't called」って言っちゃうこと。磁石のルールを思い出して！
didがもう過去形を盗んじゃってるんだ。
- ✗ I didn't saw the movie.
- ✓ I didn't see the movie.
- 1'didn't' と 'wasn't' の混同:
to be動詞が必要な形容詞や場所を表す言葉にdidn'tを使わないでね。
- ✗ I didn't happy yesterday.
- ✓ I wasn't happy yesterday.
- ✗ They didn't at the gym.
- ✓ They weren't at the gym.
- 1'did' を完全に忘れる: 学習者は時々「I not go」と言っちゃうことがある。他の言語では通じるかもしれないけど、英語ではその溝を埋めるために助っ人の
didが必要なんだ。 - 2'didn't' のスペル: アポストロフィ（'）の位置に注意！
nとtの間に入るよ（notのoがあった場所だね）。did'ntやdidnt'じゃないよ。
Contrast With Similar Patterns
Present Simple の否定形とはどう違うのかな？現在形では don't や doesn't を使うよね。- Present: "I don't like pizza."（いつも／今は好きじゃない）
- Past: "I didn't like the pizza."（昨日の「あの」ピザが好きじゃなかった）
Past Continuous（過去進行形）の否定形はどうだろう？それは、ある一定期間続いていた動作について使うよ。- Past Simple: "I didn't watch the game."（試合全部が完了したイベントとして見ていない）
- Past Continuous: "I wasn't watching the game when you called."（君が電話してきたその瞬間、試合を見ている最中ではなかった）
never と比べてみてもいいかも。- "I didn't go to Paris."（特定の旅行で行かなかった）
I never went to Paris.
（人生で一度もパリに行ったことがない —— こっちの方がドラマチック！）
Quick FAQ
メッセージで didn't の代わりに did not を使ってもいい？
いいけど、すごく真面目な感じに聞こえるよ。ロボットみたいか、あるいは本気で怒ってるみたい。友達には didn't を使おう！
「didn't use to」と「didn't used to」どっちが正しい？
文法的には、did の磁石ルールがあるから didn't use to が正解。でも、話す時はどっちも同じ音に聞こえるから、カジュアルな書き物では d を付けるネイティブも多いんだ。試験では d を外して書こうね！
'he' や 'she' の時、didn't は変わる？
ううん！英語もようやく楽をさせてくれることにしたみたい。I didn't、she didn't、they didn't —— 全部同じでOKな、ワンサイズ・フィッツ・オールの文法パーティーだよ。
そもそも、なんで 'did' を使うの？
これは do-support って呼ばれるものなんだ。英語の動詞はちょっと怠け者で、否定や疑問の重荷を運ぶために助っ人が必要なんだよ。did を動詞の専属秘書（パーソナル・アシスタント）だと思ってみて。
2. Past Simple Negative Conjugation
| Subject | Auxiliary (Negative) | Main Verb (Base Form) | Example |
|---|---|---|---|
|
I
|
didn't
|
work
|
I didn't work.
|
|
You
|
didn't
|
work
|
You didn't work.
|
|
He
|
didn't
|
work
|
He didn't work.
|
|
She
|
didn't
|
work
|
She didn't work.
|
|
It
|
didn't
|
work
|
It didn't work.
|
|
We
|
didn't
|
work
|
We didn't work.
|
|
They
|
didn't
|
work
|
They didn't work.
|
Full Form vs. Contraction
| Full Form | Contraction | Usage Note |
|---|---|---|
|
did not
|
didn't
|
Use 'did not' for formal writing or emphasis.
|
Meanings
The Past Simple negative is used to describe actions, events, or states that did not occur at a specific time in the past.
Completed Actions
To state that a specific action was not completed in the past.
“They didn't finish the project on time.”
“He didn't call me last night.”
Past Habits
To describe things that were not regular habits or routines in the past.
“I didn't smoke when I was younger.”
“She didn't exercise much last year.”
Refusal
To indicate that someone was unwilling to do something in a past situation.
“The car didn't start this morning.”
“He didn't help me with the bags.”
Reference Table
| 主語（誰が） | 助動詞 + not | 動詞の原形（何を） | 例文 |
|---|---|---|---|
|
I
|
didn't
|
study
|
I didn't study for the exam.
|
|
You
|
didn't
|
call
|
You didn't call me back.
|
|
He
|
didn't
|
arrive
|
He didn't arrive on time.
|
|
She
|
didn't
|
finish
|
She didn't finish her coffee.
|
|
It
|
didn't
|
work
|
It didn't work yesterday.
|
|
We
|
didn't
|
eat
|
We didn't eat dinner together.
|
|
They
|
didn't
|
see
|
They didn't see the movie.
|
フォーマル度スペクトル
I did not attend the conference. (attendance)
I didn't go to the meeting. (attendance)
I didn't show up. (attendance)
I ghosted. (attendance)
過去の否定形：「didn't」ルール
基本的な構造
- 主語 誰が、または何が行動しなかったか
- didn't 助動詞 'did' + 'not'
- 動詞の原形 行動を表す動詞の元の形
主な使い方
- 行動を否定する 何かが起こらなかったと言う
- 過去の出来事 満たされなかった過去の出来事を記述する
- 過去の習慣 過去に通常しなかったこと
よくある間違い
- didn't + 過去動詞 例: 'didn't went' (間違い)
- didn't + was/were 例: 'didn't was' (間違い)
- No 'didn't' 例: 'She not come' (間違い)
過去形：肯定形 vs. 否定形
過去の否定形（行動動詞）の作り方：フローチャート
過去に何かが起こらなかったことを言いたいですか？
主動詞は「be動詞」（am, is, are, was, were）ですか？
主動詞はどんな形にするべきですか？
それらを組み合わせましょう！
「didn't」と使う動詞
規則動詞
- • didn't play
- • didn't start
- • didn't listen
不規則動詞
- • didn't go
- • didn't have
- • didn't see
よくある間違い（避けて！）
- • didn't went
- • didn't knew
- • didn't was
レベル別の例文
I didn't eat lunch.
I did not eat lunch.
She didn't like the cake.
She did not like the cake.
They didn't play football.
They did not play football.
We didn't go to the park.
We did not go to the park.
I didn't see you at the office yesterday.
I did not see you at the office yesterday.
He didn't finish his homework on time.
He did not finish his homework on time.
The train didn't arrive at 9:00.
The train did not arrive at 9:00.
We didn't have enough money for the taxi.
We did not have enough money for the taxi.
I didn't realize that the meeting had been canceled.
I did not realize that the meeting had been canceled.
She didn't feel comfortable speaking in front of the crowd.
She did not feel comfortable speaking in front of the crowd.
They didn't intend to cause any trouble.
They did not intend to cause any trouble.
The company didn't make a profit last quarter.
The company did not make a profit last quarter.
The witness didn't provide a consistent account of the event.
The witness did not provide a consistent account of the event.
I didn't catch the last part of your presentation.
I did not catch the last part of your presentation.
The software didn't meet our technical requirements.
The software did not meet our technical requirements.
He didn't hesitate to voice his concerns.
He did not hesitate to voice his concerns.
The policy didn't yield the expected results despite the investment.
The policy did not yield the expected results despite the investment.
I didn't anticipate such a backlash from the public.
I did not anticipate such a backlash from the public.
The research didn't account for socio-economic variables.
The research did not account for socio-economic variables.
She didn't mince her words when criticizing the management.
She did not mince her words when criticizing the management.
The author didn't merely describe the setting; she brought it to life.
The author did not merely describe the setting; she brought it to life.
The treaty didn't so much end the war as pause it.
The treaty did not so much end the war as pause it.
He didn't lift a finger to help us during the crisis.
He did not lift a finger to help us during the crisis.
The evidence didn't stand up to rigorous scrutiny.
The evidence did not stand up to rigorous scrutiny.
間違えやすい
Learners often use 'didn't' for the verb 'to be'.
Confusing finished past time with unfinished time.
Mixing up past and present negation.
よくある間違い
I no went to school.
I didn't go to school.
She not liked the movie.
She didn't like the movie.
They didn't played.
They didn't play.
I didn't was there.
I wasn't there.
He didn't ate his dinner.
He didn't eat his dinner.
We didn't had time.
We didn't have time.
I didn't saw the sign.
I didn't see the sign.
I didn't used to like it.
I didn't use to like it.
She didn't could come.
She couldn't come.
They didn't arrived yet.
They haven't arrived yet.
I did not went because...
I did not go because...
I didn't but see him.
I didn't see him.
He didn't dared to speak.
He didn't dare to speak.
文型パターン
I didn't ___ because I was ___.
They didn't ___ the ___.
She didn't ___ that you were ___.
If I didn't ___, I wouldn't have ___.
Real World Usage
Sorry I didn't reply earlier!
I didn't have much experience in my last role, but I learned quickly.
The air conditioning didn't work in our room.
The driver didn't leave the food at the door.
I didn't expect this post to go viral!
The pain didn't start until this morning.
動詞の原形が一番の友達！
「be動詞」とは組み合わせないで！
１日の終わりに練習しよう！
短縮形が一番！
Smart Tips
Think of 'didn't' as a vacuum cleaner that sucks the -ed off the verb.
Relax! In the negative, there are NO irregular verbs. Every verb uses its base form.
Separate 'did' and 'not' and stress the word 'not'.
Remember: 'Be' is a strong verb; it doesn't need 'did' to help it.
発音
The 't' in didn't
In fast speech, the 't' at the end of 'didn't' is often silent (a glottal stop).
Stress on 'didn't'
We usually stress 'didn't' to emphasize the negation.
Falling Intonation
I didn't see it. ↘
A definitive statement of fact.
暗記しよう
記憶術
DIDN'T is the 'Tense Thief': it steals the -ed and the irregular change, leaving the verb in its base form.
視覚的連想
Imagine a small robot named 'Didn't' holding a magnet. When it stands next to a past-tense verb like 'went', its magnet pulls the 'past-ness' out, turning 'went' back into 'go'.
Rhyme
With 'didn't' in the lead, the verb has no need for -ed!
Story
Once there was a verb named 'Played' who was very tired of carrying his heavy '-ed' backpack. One day, his friend 'Didn't' came over and offered to carry the past tense for him. 'Played' took off his backpack and became 'Play' again, feeling light and simple.
Word Web
チャレンジ
Look around your room and name three things you DIDN'T do today (e.g., 'I didn't clean the window', 'I didn't paint the wall').
文化メモ
Using 'did not' instead of 'didn't' can sound very angry or firm. Parents often use 'did not' when scolding children.
In some dialects, 'didn't' might be replaced with 'ain't' for past negation, though this is non-standard.
British speakers often use 'didn't' for things Americans might use 'haven't' for, especially with 'just'.
The use of 'do' as an auxiliary verb (do-support) emerged in Middle English and became standard by the 17th century.
会話のきっかけ
What is something you didn't do last weekend?
Tell me about a movie you didn't like.
Did you go on holiday last year? If not, why not?
Think of a famous historical event. What didn't happen that people think did?
日記のテーマ
よくある間違い
Test Yourself
I ___ (go) to the party last night because I was sick.
Find and fix the mistake:
She didn't finished her homework.
Translate into English: 'Ellos no vieron la película.'
Answer starts with: ["T...
Score: /3
練習問題
8 exercisesI ___ (eat) breakfast this morning.
Find and fix the mistake:
She didn't liked the movie.
Which sentence is correct?
He bought a new car.
I saw him.
A: Did you call me? B: No, I ___.
Select the correct one:
We use 'didn't' with the verb 'to be' (e.g., I didn't be).
Score: /8
Practice Bank
11 exercisesWe ___ (eat) breakfast before the early flight.
正しい文を選びましょう。
主語と正しい形を合わせましょう。
The computer didn't worked properly yesterday.
Translate into English: 'No tuvimos tiempo para visitar el museo.'
My phone battery ___ (last) very long during the trip.
これらの単語を並べ替えて文を作りましょう。
Although I tried, the old car didn't started.
Translate into English: 'Ella no estaba en casa cuando llamé.'
どの文が正しいですか？
これらの単語を並べ替えて、意味の通る文を作りましょう。
Score: /11
よくある質問 (8)
No. You must use the base form 'go'. 'Didn't' already shows the past tense, so you don't need to change the main verb. Say `I didn't go`.
'Didn't' is a contraction used in speaking and casual writing. 'Did not' is more formal and used for emphasis. For example, `I did not do it!` sounds much stronger than `I didn't do it.`
No. The verb 'to be' is special. You just add 'not' to 'was' or 'were' to make `wasn't` or `weren't`. Never say `didn't was`.
Yes! One of the best things about the past simple negative is that `didn't` is used for all subjects: I, you, he, she, it, we, they.
Yes, you can use 'never' to mean 'not once'. For example, `I never saw that movie.` However, 'didn't' is more common for specific events.
In English, most verbs cannot be made negative by themselves. They need a 'helping' (auxiliary) verb. 'Do' is the helper we use for the simple tenses.
Yes! It works for both regular (didn't walk) and irregular (didn't run) verbs. The main verb always stays in the base form.
Most native speakers don't pronounce the 't' clearly. It sounds more like `did-un`. The tongue stops the air for the 't' but doesn't always release it.
Scaffolded Practice
1
2
3
4
Mastery Progress
Needs Practice
Improving
Strong
Mastered
In Other Languages
No + [Past Verb]
English uses an auxiliary (didn't); Spanish does not.
ne ... pas
French negates the auxiliary 'have' in the past; English uses 'did'.
[Verb] + nicht
Word order: English is 'didn't + verb', German is 'verb + nicht'.
-masen deshita
Japanese uses suffixes; English uses auxiliary verbs.
lam + [Present Verb]
Both use a particle that 'resets' the main verb's form.
méiyǒu + [Verb]
Chinese has no tense markers at all; English 'did' carries the tense.
Learning Path
Prerequisites
Learn These First
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【英語の過去形 否定文】 did not ／ didn't の使い方と注意点【中学英語】
モリケン先生の英語教室
過去の否定文（didn't）が完璧に理解できる！【ネイティブが解説】
Rei's English Room
英語【過去形の否定文】I didn't play baseball.｜did notの作り方と注意点を解説
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