Grammar Rule in 30 Seconds
Colors describe nouns and usually sit right before them or after the verb 'to be'.
- Place the color before the noun: 'The red apple'.
- Place the color after 'is' or 'are': 'The sky is blue'.
- Colors never change for plural nouns: 'Two green trees', not 'greens trees'.
Overview
red（赤）、blue（青）、green（緑）の3色に焦点を当てます。a red apple と言います。この a はどこから来たのでしょうか？ また、日本語の「青（あお）」が指す範囲と、英語の blue が指す範囲には、文化的な違いによる「ズレ」が存在します。- 日本語：赤い + 車
- 英語：
red+car→a red car（一台の赤い車）
a や the といった冠詞が必要になることが多いという点に注意が必要です。red は、名詞が一つでもたくさんあっても、過去の話でも、形は常に red のままです。a red apple（一つの赤いリンゴ）two red apples（二つの赤いリンゴ）
be動詞（am, is, are）を使って主語と色を結びつけます。The sky is blue.（空は青いです。）The leaves are green.（葉っぱは緑色です。）
is や are といった動詞が必要になるという点が、日本語（「は」と「です」で構成される構造）との大きな違いです。a や the を忘れないようにしましょう。a + red + pen | a red pen | 一本の赤いペン |the + blue + sea | the blue sea | その青い海 |green + tea | green tea | 緑茶（お茶は数えられないので a は不要） |Red:I have a red bag.（私は赤いバッグを持っています。）Blue:He likes blue shirts.（彼は青いシャツが好きです。）Green:We see green trees.（私たちは緑の木々を見ています。）
My car | is | red | My car is red. |Her eyes | are | blue | Her eyes are blue. |The grass | is | green | The grass is green. |a は付けません。The car is a red. とは言わないので注意しましょう。状態を説明しているだけだからです。- 「あの赤いカップを取ってください」→
Please take that red cup. - 「私のカバンは青色です」→
My bag is blue.
- 「彼は赤いネクタイをしています」→
He is wearing a red tie. - 「緑色の看板の店で会いましょう」→
Let's meet at the shop with the green sign.
- 「山がとても緑でした」→
The mountains were very green. - 「海が真っ青で綺麗でした」→
The ocean was beautiful and blue.
green と言う点です。- 「信号が赤です（止まれ）」→
The light is red. - 「信号が青（緑）になりました」→
The light turned green.
- 間違い:
I have two reds pens. - 正しい:
I have two red pens. - 理由: 英語の形容詞は、名詞がどれだけ増えても形を変えません。
redsとなるのは、色が「名詞（赤色というもの）」として使われる特殊な場合だけです。
- 間違い:
I bought red car. - 正しい:
I bought a red car. - 理由: 英語では「数えられる名詞」が単数で出てくる場合、その前に
aやtheを置くという鉄則があります。形容詞（色）があっても、そのルールは変わりません。a + [色] + [名詞]のセットで覚えましょう。
- 間違い:
The traffic light is blue. - 正しい:
The traffic light is green. - 理由: 英語ネイティブにとって、信号の色や木の葉の色は明らかに
greenです。もしblueと言ってしまうと、相手は「空のような真っ青な信号機」を想像して混乱してしまいます。
I like red. | 名詞 | 「赤という色そのもの」が好き。 |I like red cars. | 形容詞 | 「赤い車」というカテゴリーが好き。 |I like red.（名詞）と I like the red one.（形容詞＋代名詞）の使い分けに注意しましょう。green's pen とは言いません。green's pen | green pen |red of shirt | red shirt |a red apple と the red apple はどう使い分けますか？a を使います。すでに話に出てきている、あるいは相手もどのリンゴか分かっている「その赤いリンゴ」なら the を使います。日本語の「ある～」と「その～」の違いに近いですね。light blue（水色）や dark green（深緑）のように、色の濃さを言いたい時はどうすればいいですか？light（明るい・薄い）や dark（暗い・濃い）を置くだけでOKです！a light blue shirt（水色のシャツ）dark green leaves（濃い緑の葉）
is は絶対に必要ですか？The car red. は文になりません。必ず The car is red. と、主語と色を is でつなぎましょう。and を使ってつなぎます。a red and blue ball（赤と青のボール）The flag is red, white, and blue.（その旗は赤、白、青です。）
red, blue, green というシンプルな言葉から始めて、少しずつ表現の幅を広げていきましょう。語順と冠詞、そして「青と緑の違い」に気をつければ、あなたの英語はぐっとネイティブに近づきます。これからも一緒に頑張りましょう（Keep it up!）Using Colors with the Verb 'To Be'
| Subject | Verb (To Be) | Color Adjective | Example |
|---|---|---|---|
|
I
|
am
|
red
|
I am red (from the sun).
|
|
You
|
are
|
blue
|
You are blue.
|
|
He/She/It
|
is
|
green
|
It is green.
|
|
We
|
are
|
red
|
We are red.
|
|
They
|
are
|
blue
|
They are blue.
|
|
The apple
|
is
|
red
|
The apple is red.
|
|
The apples
|
are
|
red
|
The apples are red.
|
Contractions with Colors
| Full Form | Contraction | Meaning |
|---|---|---|
|
It is red
|
It's red
|
Describing one thing
|
|
They are blue
|
They're blue
|
Describing many things
|
|
The car is green
|
The car's green
|
Informal spoken form
|
Meanings
Colors are descriptive adjectives used to identify the visual appearance of an object based on the light it reflects.
Literal Description
Identifying the actual physical color of an object.
“A red car”
“The blue ocean”
Symbolic/Metaphorical
Using colors to represent feelings or states of being.
“I feel blue (sad)”
“He is green with envy (jealous)”
Categorical/Functional
Using colors to categorize items or signals.
“The red light means stop”
“The green folder is for math”
Reference Table
| 色 | 意味 | 例文 (英語) | 例文 (日本語) |
|---|---|---|---|
|
Red
|
血や火のような赤色
|
I have a `red` bag.
|
私は赤いバッグを持っています。
|
|
Blue
|
空や海のような青色
|
She likes her `blue` hat.
|
彼女は青い帽子が気に入っています。
|
|
Green
|
草や葉っぱのような緑色
|
Look at the `green` tree.
|
あの緑の木を見てください。
|
|
形容詞の位置
|
名詞の前に置く
|
`red` apple
|
赤いリンゴ（語順に注目！）
|
|
複数形でも不変
|
形は変わりません
|
Two `blue` pens.
|
2本の青いペン。
|
|
主な使い方
|
物や自然を説明
|
`green` light
|
青信号（英語ではgreenです！）
|
フォーマル度スペクトル
The vehicle is crimson in hue. (Transportation)
The car is red. (Transportation)
Check out that red ride. (Transportation)
That whip is fire red. (Transportation)
色の使い方：Red, Blue, Green
位置
- 名詞の前 red apple
変化なし
- 複数形にしない two green trees
基本の色
- Red fire, apples
- Blue sky, ocean
- Green grass, leaves
英語と他の言語の比較（色の位置）
色で説明する時のフローチャート
名詞を説明したいですか？
何色ですか？
説明する名詞は何ですか？
例えば？
身の回りの色
赤いもの
- • apple
- • heart
- • stop sign
青いもの
- • sky
- • ocean
- • jeans
緑のもの
- • grass
- • tree
- • leaf
レベル別の例文
The apple is red.
The apple is red.
I have a blue pen.
I have a blue pen.
The grass is green.
The grass is green.
Red, blue, and green are colors.
Red, blue, and green are colors.
She is wearing a dark blue dress.
She is wearing a dark blue dress.
The sky is not green; it is blue.
The sky is not green; it is blue.
Are those red flowers for me?
Are those red flowers for me?
My new bike is bright green.
My new bike is bright green.
He bought a beautiful, small, red car.
He bought a beautiful, small, red car.
The ocean looked very blue yesterday.
The ocean looked very blue yesterday.
I prefer the green one over the red one.
I prefer the green one over the red one.
The room was painted a soft shade of blue.
The room was painted a soft shade of blue.
The leaves turn red and orange in October.
The leaves turn red and orange in October.
He was green with envy when he saw my car.
He was green with envy when he saw my car.
The company is finally out of the red.
The company is finally out of the red.
A deep blue light filled the laboratory.
A deep blue light filled the laboratory.
The cerulean sky was devoid of any clouds.
The cerulean sky was devoid of any clouds.
The project was delayed by excessive red tape.
The project was delayed by excessive red tape.
She felt a bit blue after the holidays ended.
She felt a bit blue after the holidays ended.
The verdant hills of Ireland are world-famous.
The verdant hills of Ireland are world-famous.
The sunset reddened the ancient stone walls.
The sunset reddened the ancient stone walls.
His argument was a red herring to distract us.
His argument was a red herring to distract us.
The artist's use of primary blues evokes a sense of coldness.
The artist's use of primary blues evokes a sense of coldness.
The emerald canopy provided a respite from the sun.
The emerald canopy provided a respite from the sun.
間違えやすい
Learners might think 'I am blue' always means the color of their skin.
Using 'the red' instead of 'the red one'.
Learners get confused because the word is identical.
よくある間違い
The apple red.
The red apple.
Two greens apples.
Two green apples.
It is a blue.
It is blue.
The sky blue.
The sky is blue.
A blue dark car.
A dark blue car.
The car is more red.
The car is redder.
I like the blue color shirt.
I like the blue shirt.
A red big house.
A big red house.
He is feeling the blue.
He is feeling blue.
The red-colored tape.
The red tape.
文型パターン
The ___ is ___.
I have a ___ ___.
Do you like ___ ___?
The ___ looks ___ today.
Real World Usage
The light is red; you must stop.
Do you have this in blue?
The grass is so green after the rain.
Loving my new red hair! #newlook
Please put the files in the green folder.
Add some green peppers to the pizza.
色は常に「前」！
Thinkblue sky, notsky blue!
色は変化しません！
two red cars, never two reds cars."身の回りで練習！
Say it out loud:red mug,green plant,blue book.
色のイメージ
These cultural meanings add another layer to your understanding!
Smart Tips
Remember that adjectives are 'lazy' in English—they never change for plurals!
Add 'light' or 'dark' before the color name.
Use the word 'one' after the color to avoid repeating the noun.
Don't take it literally! Colors often represent emotions in English.
発音
Red
Short 'e' sound like in 'bed'. Do not roll the 'r'.
Blue
Long 'u' sound like in 'shoe'. The 'e' is silent.
Green
Long 'e' sound like in 'see'. Make it long and clear.
Emphasis on Color
The RED apple (not the green one).
Used to contrast two different items.
暗記しよう
記憶術
R.B.G. - Really Bright Graphics! (Red, Blue, Green).
視覚的連想
Imagine a stoplight. Red is at the top (Stop), Green is at the bottom (Go), and the Blue sky is behind it all.
Rhyme
The sky is blue, the grass is green, the prettiest red apple I have ever seen!
Story
A little boy in a red hat walked through a green forest. He looked up and saw a bright blue bird flying in the sky.
Word Web
チャレンジ
Look around your room. Find 3 things that are red, 3 that are blue, and 3 that are green. Say them out loud: 'The [object] is [color]'.
文化メモ
Red is the color of luck, joy, and prosperity. It is used extensively in weddings and New Year celebrations.
Blue is often associated with sadness ('feeling blue') but also with stability and trust (police uniforms, corporate logos).
Green is the national color of Ireland and is associated with luck and the 'Emerald Isle'.
Most basic English color words come from Proto-Indo-European roots via Old English.
会話のきっかけ
What is your favorite color?
What color is your car/bike?
Look at the sky. What color do you see?
If you could paint your room any color, what would it be?
日記のテーマ
よくある間違い
Test Yourself
I see a ___ car.
正しい文を選んでください：
The blue sky と言うこともできます。Find and fix the mistake:
She has a shirt green.
Score: /3
練習問題
8 exercisesWhich one is correct?
The sky is ___.
Find and fix the mistake:
I have two reds pens.
green / is / The / grass
Apple, Sky, Grass
I see three ___.
___ the car blue?
Select the negative form.
Score: /8
Practice Bank
12 exercisesThe stop light is usually ___.
正しい文を選んでください：
英語に直してみましょう： 'Ella tiene un perro verde.' (彼女は緑の犬を飼っています)
Look at the tree green.
単語を並べ替えて文を作ってください：
The ocean is usually ___.
物と一般的な色を組み合わせてください：
英語に直してみましょう： 'Ella quiere un coche azul.' (彼女は青い車を欲しがっています)
単語を並べ替えて文を作ってください：
I have two red apples.
正しい文を選んでください：
色と一般的な物を組み合わせてください：
Score: /12
よくある質問 (8)
No, in English the color always comes before the noun: 'The red car'.
No, colors never change. You say 'one red book' and 'two red books'.
It is two words. 'Light' describes the shade of 'blue'.
No, colors are common adjectives and are not capitalized unless they start a sentence.
'-ish' means 'a little bit'. So 'reddish' means 'kind of red'.
You say: 'What is your favorite color?'
Yes, for example: 'Blue is my favorite.' Here, 'Blue' is the subject.
It is both! Context tells you which one is being used.
Scaffolded Practice
1
2
3
4
Mastery Progress
Needs Practice
Improving
Strong
Mastered
In Other Languages
el coche rojo
Word order and lack of agreement in English.
la voiture rouge
English adjectives are invariable.
das rote Auto
English has no adjective declension.
akai kuruma (赤い車)
Japanese has specific grammatical categories for colors (i-adjectives vs. nouns).
al-sayyara al-hamra (السيارة الحمراء)
Complete agreement and reverse word order.
hóngsè de chē (红色的车)
No need for a connecting particle in English.
