Grammar Rule in 30 Seconds
Use 'as...as' to show that two things are the same in some way, like a mirror image.
- Use 'as + adjective + as' for equality: 'He is as tall as me.'
- Use 'not as + adjective + as' for inequality: 'It's not as cold as yesterday.'
- Never use comparative '-er' forms inside the sandwich: 'as fast as', not 'as faster as'.
Overview
taller than（〜より背が高い）や more expensive than（〜より高価な）のような比較級は違いを強調し、the tallest（最も背が高い）や the most expensive（最も高価な）のような最上級は極端な例を特定しますが、as...as の構文は、等しさや同等性を表現するという、独特で重要な目的を持っています。このパターンを使うことで、優劣を示さずに、二つ以上のものが特定の性質や量を全く同じ程度で共有していることを述べることができます。as...as を使いこなすことは、微妙な類似点を正確に表現する能力を高め、記述をより豊かで正確なものにします。これは、世界を正確に描写するための基礎を築き、二つの要素が特定の側面で完全に似ていることを明確に伝えることを可能にします。この構文は、より複雑な比較構造への足がかりとなります。as...as は相関接続詞として機能し、文中の二つの要素を結びつけてバランスの取れた比較を確立します。最初の as は、その性質の基準または程度を示し、二番目の as は、その基準と比較される対象を導入します。この構造は、英語の比較の核となる原則、すなわち、違いだけでなく、正確な並行性をも簡潔かつ体系的に特定する能力を反映しています。as...as 構文は、同じ程度の性質を伝えるために特別に設計された文法的な枠組みです。これは、まるで言語的な天秤のように機能し、構造の両側に置かれた二つの項目が、使用されている形容詞または副詞に関して全く同じ「重み」を持っていることを示します。基本的なルールは、二つの as の間に形容詞または副詞を直接置き、この中央の単語が比較される特性を定義することです。as intelligent as her friend.」（私の姉は彼女の友人と同じくらい賢い）という文を見てみましょう。ここでは、形容詞 intelligent（賢い）が焦点です。最初の as は比較の準備を整え、「私の姉」が intelligence（知性）という性質をどの程度持っているかを示します。それに続く as は、参照点である「彼女の友人」を導入し、「私の姉」と「彼女の友人」の両方が、全く同じ程度で intelligence という性質を共有していることを確認します。ここでは、一方が「より賢い」とか「あまり賢くない」とは言っておらず、彼らの知性のレベルが等しいことを述べています。as...as 構文は、二つの動作が同じ強度で、または同じ方法で行われるかを説明します。例えば、「He sings as beautifully as a professional.」（彼はプロのように美しく歌う）です。副詞 beautifully（美しく）は動詞 sings（歌う）を修飾します。そして as...as 構文は、彼の歌唱パフォーマンスが、美しさという点においてプロの基準に匹敵することを肯定します。この構文は、性質、量、および行動における正確な並行性を表現するための不可欠なツールであり、コミュニケーションに明確さと正確さを提供します。as...as 構造は体系的であり、等しさやその不在を正確に表現することを可能にします。その中心的な原則は、二つの as の間に形容詞、副詞、または数量詞を埋め込むことです。これらの異なるパターンを理解することは、正確で流暢な使用のために不可欠です。- 形容詞の場合:
主語 + 動詞（しばしば 'to be'） + as + 形容詞 + as + 名詞/代名詞/節 The new phone isas expensive asthe old one.（新しい電話は古いものと同じくらい高価だ。）（両方の電話の価格が同じであることを意味します。）Her hair isas long asmine is.（彼女の髪は私の髪と同じくらい長い。）（私たちの髪の長さが同じであることを意味します。）This task isas difficult asthe last project was.（このタスクは前回のプロジェクトと同じくらい難しい。）（難易度が同一であることを意味します。）
- 副詞の場合:
主語 + 動詞 + as + 副詞 + as + 名詞/代名詞/節 He can runas fast asa professional athlete does.（彼はプロのアスリートと同じくらい速く走れる。）（彼のスピードがプロに匹敵することを意味します。）You should writeas clearly asthe instructions allow.（指示が許す限り、明確に書いてください。）（あなたの文章の明瞭さが可能な最大値に一致すべきであることを意味します。）They finished the workas quickly astheir competitors did.（彼らは競合他社と同じくらい速く仕事を終えた。）（彼らの完了スピードが同じだったことを意味します。）
as + [形容詞/副詞] + as | She is as kind as her mother.（彼女はお母さんと同じくらい親切だ。） | He drives as carefully as his wife.（彼は妻と同じくらい慎重に運転する。） |not を導入します。英語には、否定的な比較のための二つの主な選択肢があり、トーンとフォーマルさに微妙な違いがあります。not as + 形容詞/副詞 + as（より一般的でニュートラル）: これは最も頻繁に使用される否定形であり、単に等しさの欠如を述べています。最初の項目が2番目の項目よりもその性質を少ない程度で持っていることを意味します。This coffee isn'tas hot asI like it.（このコーヒーは私が好きなほど熱くない。）（あなたの好みの温度より冷たいことを意味します。）She doesn't speak Frenchas fluently asher colleague does.（彼女は同僚ほど流暢にフランス語を話さない。）（同僚の方が流暢であることを意味します。）The new laptop isn'tas powerful asI expected.（新しいラップトップは期待したほど強力ではない。）（予想よりもパワーが低いことを意味します。）
not so + 形容詞/副詞 + as（ややフォーマルまたは強調的）: 日常会話ではあまり一般的ではありませんが、この構造は文法的に正しく、しばしばややフォーマルまたは強調的なトーンを持ちます。等しさからの大きな乖離を示唆したり、満たされていない期待される等しさを示唆したりすることがあります。The weather isn'tso warm asit was yesterday.（昨日のようには暖かくない。）（顕著な気温低下を示唆します。）He didn't performso well ashis teammates.（彼はチームメイトほど良くパフォーマンスを発揮しなかった。）（彼のパフォーマンスが彼らより明らかに下だったことを示唆します。）The solution was notso simple asit appeared.（解決策は見た目ほど単純ではなかった。）（予期せぬ複雑さを強調します。）
not as...as | 一般的、ニュートラル；「〜より少ない」を意味する。 | This car isn't as fast as that one.（この車はあれほど速くない。） | She doesn't cook as often as he does.（彼女は彼ほど頻繁に料理しない。） |not so...as | よりフォーマル/強調的；「決して〜ほどではない」を意味する。 | The film wasn't so good as the book.（その映画は本ほど良くなかった。） | They don't earn so much as their rivals.（彼らはライバルほど多く稼いでいない。） |as much as と as many asas much as + 数えられない名詞 + as: 個別に数えられない名詞（例：water、time、information、money、patience、effort）に使用します。I don't haveas much time asyou to complete this report.（このレポートを完成させるのに、あなたほど時間がない。）She drinksas much water asher coach recommends.（彼女はコーチが勧めるだけの水を飲む。）He earnsas much money ashis business partner does.（彼はビジネスパートナーと同じだけのお金を稼いでいる。）
as many as + 数えられる名詞 + as: 個別に数えられる名詞（例：books、friends、ideas、students、problems、mistakes）に使用します。There wereas many students aschairs in the classroom.（教室には椅子の数と同じだけの学生がいた。）My neighbor hasas many cats asI have dogs.（私の隣人は私の犬と同じ数の猫を飼っている。）We receivedas many complaints ascompliments today.（今日は賛辞と同じ数の苦情を受け取った。）
as much as + [数えられない名詞] + as | I need as much sugar as you can spare.（あなたが余分に持っているだけの砂糖が必要です。） |as many as + [数えられる名詞] + as | She has as many shoes as I have books.（彼女は私の本と同じ数の靴を持っている。） |as...as 構造は、しばしば慣用的な意味を持つ多くの有用な定型句に不可欠です。as soon as (possible): 緊急性を示します。「Please replyas soon as possible`.
2. Common Contractions with Negatives
| Full Form | Contraction | Usage |
|---|---|---|
|
is not as
|
isn't as
|
Singular subjects
|
|
are not as
|
aren't as
|
Plural subjects
|
|
was not as
|
wasn't as
|
Past singular
|
|
were not as
|
weren't as
|
Past plural
|
The As...As Structure
| Type | First Part | Middle (Adjective/Adverb) | Second Part | Example |
|---|---|---|---|---|
|
Affirmative
|
as
|
tall
|
as
|
as tall as
|
|
Negative
|
not as
|
expensive
|
as
|
not as expensive as
|
|
Adverb
|
as
|
quickly
|
as
|
as quickly as
|
|
Quantity (Countable)
|
as many
|
books
|
as
|
as many books as
|
|
Quantity (Uncountable)
|
as much
|
time
|
as
|
as much time as
|
|
Emphatic
|
just as
|
good
|
as
|
just as good as
|
Meanings
A grammatical structure used to compare two people, things, or situations to show they possess a quality in the same degree.
Equality of Quality
Showing two things have the same characteristic.
“She is as smart as her brother.”
“This cake is as delicious as the one my mom makes.”
Equality of Quantity
Using 'much' or 'many' to compare amounts.
“I have as many books as you.”
“He doesn't drink as much water as he should.”
Negative Comparison
Showing one thing has less of a quality than another.
“Running is not as fast as cycling.”
“The hotel wasn't as clean as we expected.”
Adverbial Equality
Comparing the way an action is performed.
“He can run as quickly as a professional athlete.”
“Please finish the report as soon as possible.”
Reference Table
| 種類 | 構造 | 例 | 意味 |
|---|---|---|---|
|
肯定
|
as + 形容詞 + as
|
As fast as
|
全く同じ速さ
|
|
否定
|
not as + 形容詞 + as
|
Not as expensive as
|
他よりも安い
|
|
数えられる名詞
|
as many as + 名詞
|
As many apps as
|
同じ数のアプリ
|
|
数えられない名詞
|
as much as + 名詞
|
As much data as
|
同じ量のデータ
|
|
副詞
|
as + 副詞 + as
|
As quickly as
|
同じ行動の速さ
|
|
可能性
|
as ... as possible
|
As soon as possible
|
できるだけ早く
|
フォーマル度スペクトル
He performs the task as efficiently as his predecessor. (Workplace performance)
He is as fast as the previous worker. (Workplace performance)
He's as quick as the last guy. (Workplace performance)
He's just as cracked as the other dude. (Workplace performance)
「As...As」を使った比較方法
形容詞
- as big as same size
- as happy as same mood
副詞
- as fast as same speed
- as well as same quality
量
- as many as countable
- as much as uncountable
「As...As」と比較級の比較
どちらを使うべき？
二つのものは同じくらい？
数えられる名詞？
「As...As」を使った現代の慣用句
速さ
- • As soon as possible
- • As fast as light
描写
- • As good as new
- • As clear as day
ユーモア
- • As blind as a bat
- • As quiet as a mouse
レベル別の例文
He is as old as me.
He is the same age.
The dog is as big as the cat.
They are the same size.
Is it as hot as yesterday?
Is the temperature the same?
I am as happy as you.
We have the same feeling.
This book isn't as interesting as the last one.
The last book was better.
Can you run as fast as him?
Is your speed equal to his?
My car is as old as yours.
Our cars have the same age.
The water is not as cold as I thought.
It is warmer than expected.
I don't earn as much money as my sister.
My sister earns more.
Please call me as soon as you arrive.
Call immediately upon arrival.
He speaks as clearly as a news reporter.
His clarity is equal to a professional.
There aren't as many people here as last year.
The crowd is smaller now.
The results were just as good as we had hoped.
The results met our expectations perfectly.
It's not nearly as difficult as it looks.
It is much easier than it appears.
She works twice as hard as her colleagues.
Her effort is double that of others.
The new model is every bit as reliable as the old one.
Reliability has not decreased at all.
The situation is not so much a crisis as a challenge.
It's better described as a challenge than a crisis.
As many as ten thousand protesters gathered in the square.
A surprisingly high number (10,000) gathered.
He was as much a philosopher as he was a scientist.
He held both roles equally.
The film is as visually stunning as it is narratively weak.
It has great visuals but a poor story.
As often as not, he forgets his keys when he leaves.
He usually forgets his keys.
The project was as good as finished by the time I arrived.
The project was almost completely done.
He is as brave a man as ever lived.
He is extremely brave, comparable to anyone in history.
As much as I admire his work, I cannot agree with his methods.
Although I admire him, I disagree.
間違えやすい
Learners often mix the two because both are used for comparisons.
Choosing between countable and uncountable nouns.
Both can show similarity.
よくある間違い
He is as tall than me.
He is as tall as me.
She is as taller as me.
She is as tall as me.
I am as big you.
I am as big as you.
It is as better as that.
It is as good as that.
I don't have as many money as him.
I don't have as much money as him.
He runs as quick as me.
He runs as quickly as me.
This is not so good as that.
This is not as good as that.
I have as many as five dollar.
I have as many as five dollars.
He is as tall as I.
He is as tall as me. (or) He is as tall as I am.
It's not as much a problem than a disaster.
It's not so much a problem as a disaster.
文型パターン
I am as ___ as my ___.
This ___ isn't as ___ as that ___.
He can ___ as ___ as a ___.
Real World Usage
This camera isn't as good as the reviews said.
I am as experienced as the other candidates.
I'll be there as soon as I can!
Tomorrow won't be as sunny as today.
He's not as fast as he used to be.
The hotel was as nice as the pictures.
比較級の落とし穴
丁寧な否定
現代の「ASAP」
Smart Tips
Visualize a mirror. Whatever adjective you use to describe one, the other must reflect it exactly between the two 'as' words.
Use the negative 'not as...as' instead of a direct negative adjective.
Stop! If you are using 'as...as', remove the -er immediately.
Check if you can count the items on your fingers. If yes, use 'many'. If no, use 'much'.
発音
The Weak 'As'
In natural speech, the word 'as' is usually unstressed and sounds like /əz/ (rhymes with 'fuzz' but very short).
Equality Stress
He's as TALL as ME.
Stress the adjective and the final pronoun to emphasize the comparison.
暗記しよう
記憶術
AS...AS is like a pair of glasses; you need both sides to see the equality clearly.
視覚的連想
Imagine a sandwich where the two pieces of bread are the word 'AS' and the filling is the adjective. You can't have a sandwich with only one piece of bread!
Rhyme
Two 'as' in a row, make the equality show.
Story
Once there were two twins, Alex and Sam. Alex was as tall as Sam, as fast as Sam, and as kind as Sam. They lived in a house that was as big as a castle.
Word Web
チャレンジ
Look around your room. Find two objects and describe them using 'as...as' (e.g., 'My pen is as long as my phone'). Do this for 5 pairs of objects.
文化メモ
British speakers often use 'as...as' in traditional similes like 'as thick as two short planks' (meaning someone is not very smart).
In the US, 'as...as' is frequently used in business idioms like 'as of yet' or 'as per our conversation'.
Australians often shorten the structure in very casual speech, though the full 'as...as' remains the standard.
The word 'as' comes from the Old English 'alswā', which means 'all so' or 'entirely so'.
会話のきっかけ
Is your hometown as big as the city you live in now?
Do you think learning English is as difficult as learning math?
Is your current job as stressful as your previous one?
Is the movie version of your favorite book as good as the original?
日記のテーマ
よくある間違い
Test Yourself
My cat is as ___ as yours. (lazy)
Choose the correct comparison:
Find and fix the mistake:
I don't have as many time as you.
Score: /3
練習問題
8 exercisesShe is as ___ (smart) as her sister.
Find and fix the mistake:
The blue car is as fast than the red car.
I don't have as ___ friends as you.
The train is faster than the bus.
We use 'as...as' to show that two things are different.
A: Is the exam hard? B: No, it's not ___ as last year.
Select the grammatically correct sentence.
Match: 1. As busy as... 2. As quiet as... 3. As brave as...
Score: /8
Practice Bank
10 exercisesShe speaks English as ___ as a native speaker. (fluent)
The pizza was as better as I expected.
as / as / he / isn't / tall / brother / his
Es ist nicht so teuer wie ich dachte.
Match the pairs:
There aren't ___ people here as yesterday.
Please reply as soon ___ possible.
The movie was as long the book.
Ich renne so schnell wie du.
The hotel room ___ as nice as the photos.
Score: /10
よくある質問 (8)
In negative sentences, you can say `not so... as`, but it sounds more formal or old-fashioned. In affirmative sentences, you must use `as...as`.
In casual conversation, `as tall as me` is standard. In very formal writing, `as tall as I am` is preferred.
Yes! For example: 'He speaks as clearly as a teacher.' Just make sure to use the adverb form.
Use `as many as` for countable nouns (people, days) and `as much as` for uncountable nouns (water, love, money).
Yes, they have the same meaning, but `not as...as` is often considered more polite or descriptive.
Only in the negative form (`not as...as`). If they are equal, use the affirmative.
No, you should say `as well as` or `as good as`. Avoid using superlative forms like 'best' in this structure.
You can add `just` or `nearly`. For example: 'It's just as hot as yesterday' or 'It's nearly as big as a house.'
Scaffolded Practice
1
2
3
4
Mastery Progress
Needs Practice
Improving
Strong
Mastered
In Other Languages
tan... como
Spanish doesn't distinguish between 'as' and 'so' in this specific structure.
aussi... que
Learners often use 'than' in English because 'que' translates to both 'as' and 'than'.
so... wie
German speakers must remember not to use 'than' (als) for equality.
...to onaji kurai
The word order is completely different, with the comparison coming before the adjective.
mithla / ka-
Arabic often uses a 'like' structure rather than a double-particle 'as...as' structure.
hé... yīyàng
The structure literally translates to 'A with B same [adjective]'.
Learning Path
Prerequisites
Learn These First
関連動画
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Adjectives and Adverbs in English - 5 Levels of Difficulty
Oxford Online English
Adjectives & Adverbs | English Grammar Lesson | B1-Intermediate
Anglo-Link
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