Explanation at your level:
The sky is up. It is blue in the day. It is black at night. You can see the sun in the sky. You can see the moon in the sky. It is very big.
When you look up, you see the sky. It changes color during the day. Sometimes it is blue and sunny. Sometimes it is grey and cloudy. At night, the sky is dark and you can see stars.
The sky is the atmosphere above the Earth. We often use it to describe the weather. For example, if the sky is clear, it is a nice day. If the sky is dark, it might rain soon. It is a common topic for small talk.
Beyond just the weather, the sky often symbolizes freedom or possibility. We use phrases like 'the sky is the limit' to encourage people. In literature, writers often describe the sky to set the mood of a scene, such as a 'stormy sky' to show tension.
The term sky is deeply embedded in our language and culture. We use it in idioms that describe sudden events or grand ambitions. Academically, it refers to the celestial dome, and in meteorology, it is the primary subject of observation. Its usage spans from casual weather reports to complex metaphors about human potential.
Etymologically, sky reflects our ancient perception of the heavens. It has evolved from a simple word for 'cloud' to a vast concept encompassing the atmosphere and the infinite void of space. In high-level discourse, it serves as a powerful metaphor for the sublime, the unattainable, and the majestic. It remains a central fixture in both scientific inquiry and poetic expression, demonstrating the enduring human fascination with the space above us.
30秒でわかる単語
- The sky is the atmosphere above Earth.
- It changes color based on sunlight.
- It is a common symbol for freedom.
- The plural is skies.
When you look up, the sky is exactly what you see! It is the vast, open space that stretches above the Earth. During the day, it usually looks like a bright blue blanket, but at night, it transforms into a dark canvas filled with stars and the moon.
Think of the sky as our window to the universe. It is not just empty space; it is filled with air, clouds, and light. Whether it is a sunny afternoon or a stormy evening, the sky is always changing its mood and color, making it one of the most dynamic parts of our natural world.
The word sky has some really cool roots! It comes from the Old Norse word sky, which actually meant 'cloud.' Back in the day, people didn't distinguish between the air above and the clouds floating in it.
Over time, as English evolved, the meaning shifted from just 'cloud' to the entire expanse of the heavens. It replaced the older English word heofon (heaven) in many contexts, which had a more religious or spiritual connotation. It is a great example of how language changes to fit how we observe the world around us.
You will hear people talk about the sky in many different ways. In casual conversation, we often describe the weather, like saying 'The sky is clearing up.' In more poetic or formal settings, writers might use it to represent freedom or the infinite.
Common word combinations include clear sky, cloudy sky, and the night sky. It is a very versatile word that fits into almost any register, from talking to a toddler about the 'blue sky' to discussing atmospheric science in a lecture.
English is full of fun phrases using this word! One popular one is 'sky's the limit', which means there is no limit to what you can achieve. Another is 'out of the blue', meaning something happened unexpectedly, like a bolt from the clear sky.
You might also hear 'pie in the sky', which refers to a dream that is unlikely to happen. 'Blue sky thinking' is a corporate phrase for creative, brainstorming ideas. Finally, 'cloud nine' is related to the sky, describing a state of extreme happiness.
The word sky is a countable noun, but we almost always use it in the singular form when referring to the one above us. The plural is skies, which is often used to describe different weather conditions or vast, open areas like 'the skies over the ocean.'
Pronunciation is simple: it is a single syllable sounding like /skaɪ/. It rhymes with fly, high, dry, try, and sigh. It is a very easy word to pronounce for beginners, making it a perfect starting point for English learners.
Fun Fact
It replaced the older English word 'heofon' for the physical sky.
Pronunciation Guide
Short, sharp 's' followed by the 'kai' sound.
Very similar to UK, crisp 'k' sound.
Common Errors
- Pronouncing it like 'ski'
- Adding an extra syllable
- Softening the 'k' sound
Rhymes With
Difficulty Rating
Easy
Easy
Easy
Easy
What to Learn Next
Prerequisites
Learn Next
上級
Grammar to Know
Definite Article
The sky
Subject-Verb Agreement
The sky is
Prepositional Phrases
In the sky
Examples by Level
The sky is blue.
The sky / is / blue.
Simple subject-verb-adjective.
I see the sun in the sky.
I / see / the sun / in the sky.
Preposition 'in' used for location.
The sky is dark at night.
The sky / is / dark / at night.
Adjective describing the noun.
Look at the sky!
Look / at / the sky!
Imperative sentence.
Is the sky pretty?
Is / the sky / pretty?
Question format.
The sky has clouds.
The sky / has / clouds.
Simple present tense.
I love the sky.
I / love / the sky.
Simple verb-object.
The sky is big.
The sky / is / big.
Basic description.
The sky turned grey before the rain.
Birds fly high in the sky.
We watched the sunset in the clear sky.
The sky looked beautiful tonight.
Is that a plane in the sky?
The sky is full of stars.
I like to lie on the grass and look at the sky.
The sky is very clear today.
The sky was a brilliant shade of orange at sunset.
He pointed to the sky to show me the eagle.
The sky cleared up just in time for our picnic.
The dark sky suggested a storm was coming.
She dreams of flying across the sky.
The night sky was illuminated by the full moon.
There wasn't a cloud in the sky all day.
The city lights made it hard to see the stars in the sky.
The sky's the limit for your career if you work hard.
The painting captures the vastness of the stormy sky.
He felt a sense of peace looking up at the endless sky.
The sky darkened as the eclipse began.
They are looking for blue sky projects to invest in.
The plane disappeared into the vast blue sky.
The sky was streaked with purple and gold.
Despite the grey sky, we stayed in good spirits.
The vast, star-studded sky filled him with a sense of wonder.
The artist used a palette of moody blues for the sky.
The sky seemed to vibrate with the intensity of the storm.
Her potential is limitless; truly, the sky is the limit.
The horizon blurred where the sea met the sky.
He gazed at the sky, contemplating the mysteries of the universe.
The sky was a canvas of shifting light and shadow.
The clear sky provided perfect conditions for stargazing.
The celestial expanse of the night sky has inspired poets for centuries.
The sky, in its infinite majesty, dwarfed our small concerns.
The tempestuous sky mirrored the turmoil in his heart.
He found solace in the quietude of the darkening sky.
The sky was a bruised purple, signaling the coming gale.
The ethereal glow of the aurora borealis danced across the sky.
The vastness of the sky serves as a humbling reminder of our place in the cosmos.
The sky was an opaque dome of grey, heavy with impending snow.
類義語
よく使う組み合わせ
Idioms & Expressions
"sky's the limit"
there is no limit to what you can do
With your talent, the sky's the limit.
casual"out of the blue"
unexpectedly
He called me out of the blue.
casual"pie in the sky"
a dream that is unlikely to happen
His plan for a flying car is just pie in the sky.
casual"blue sky thinking"
creative, unconstrained brainstorming
We need some blue sky thinking for this project.
business"cloud nine"
extreme happiness
She was on cloud nine after the news.
casual"praise to the skies"
to praise someone very highly
They praised his performance to the skies.
formalEasily Confused
Both refer to the space above.
Heaven is spiritual, sky is physical.
The sky is blue; heaven is a belief.
Both are above us.
Space is beyond the atmosphere.
The sky is blue; space is black.
Both are invisible/above.
Air is the gas, sky is the view.
The air is cold; the sky is clear.
Scientific overlap.
Atmosphere is the layer, sky is the visual.
The atmosphere is thin; the sky is pretty.
Sentence Patterns
The sky is [adjective].
The sky is clear.
I see [noun] in the sky.
I see a bird in the sky.
The sky [verb] [preposition].
The sky darkened at sunset.
Across the sky, [subject] [verb].
Across the sky, clouds drifted.
The sky is the limit for [noun].
The sky is the limit for you.
語族
Nouns
Verbs
Adjectives
関連
How to Use It
9/10
Formality Scale
よくある間違い
Sky is singular here.
Use 'at' for observing.
Subject-verb agreement.
Redundant word usage.
Needs a definite article.
Tips
Memory Palace Trick
Visualize a giant blue dome over your house.
When Native Speakers Use It
We use it constantly for weather talk.
Cultural Insight
It represents limitlessness.
Grammar Shortcut
Always use 'the' before sky.
Say It Right
Keep the 'k' crisp.
Don't Make This Mistake
Don't say 'the skies is'.
Did You Know?
The sky isn't actually blue; it's light scattering.
Study Smart
Look at the sky and name its current state.
Word Expansion
Learn 'skyline' and 'skylight' together.
Creative Tip
Use color adjectives like 'azure' or 'indigo'.
Memorize It
Mnemonic
S-K-Y: See Kind Yellow (sun).
Visual Association
A bright blue dome.
Word Web
チャレンジ
Describe the sky in three words.
語源
Old Norse
Original meaning: cloud
文化的な背景
None.
Often used to represent dreams and freedom.
Practice in Real Life
Real-World Contexts
weather
- clear sky
- stormy sky
- overcast sky
travel
- blue skies ahead
- view of the sky
- sky-high views
art
- painted sky
- canvas of the sky
- shades of the sky
science
- atmospheric sky
- night sky observation
- sky mapping
Conversation Starters
"What is your favorite time of day to look at the sky?"
"Do you prefer a clear blue sky or a dramatic stormy one?"
"What do you think is the best way to describe the night sky?"
"Have you ever seen a sky that looked like a painting?"
"Does the sky affect your mood?"
Journal Prompts
Describe the sky you see right now.
If you could paint the sky any color, what would it be?
Write a story about a person who could fly into the sky.
Why do you think humans are so fascinated by the sky?
よくある質問
8 問The singular is sky, the plural is skies.
Usually we say 'the sky', but 'a clear sky' is fine.
Yes, but it is rare (e.g., to sky a ball).
Gases like nitrogen and oxygen.
Rayleigh scattering of sunlight.
Only at the start of a sentence.
A very tall building.
Yes, they are in the sky.
自分をテスト
The ___ is blue.
The sky is the object that is blue.
Which means the space above?
Sky refers to the atmosphere above.
The sky is always blue at night.
The sky is dark at night.
Word
意味
Idiom matching.
The sky is clear.
The ___ of the city was beautiful.
Skyline refers to the city buildings against the sky.
What does 'pie in the sky' mean?
It refers to an unrealistic dream.
Firmament is a synonym for sky.
Yes, it is an archaic synonym.
Word
意味
Archaic vocabulary.
Lights danced across the sky.
スコア： /10
Summary
The sky is the vast, beautiful space above us that connects our world to the universe.
- The sky is the atmosphere above Earth.
- It changes color based on sunlight.
- It is a common symbol for freedom.
- The plural is skies.
Memory Palace Trick
Visualize a giant blue dome over your house.
When Native Speakers Use It
We use it constantly for weather talk.
Cultural Insight
It represents limitlessness.
Grammar Shortcut
Always use 'the' before sky.
例文
The sky is very blue and clear this morning.
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文脈で学ぶ
関連フレーズ
Weatherの関連語
fog
A1Fog is a thick cloud of tiny water droplets suspended in the atmosphere at or near the earth's surface. it obscures or restricts visibility, making it difficult to see far ahead.
temperate
A1穏やか（おだやか）な気候は、暑すぎず寒すぎない気候のことです。一年を通して快適な温度です。
storms
B1Violent atmospheric disturbances characterized by strong winds, precipitation, and often thunder and lightning. Metaphorically, it refers to tumultuous reactions, emotional outbursts, or violent assaults.
wet
A1濡れているとは、水がかかって水分を含んでいる状態です。雨の日に外に出ると服が濡れます。
rain
A1雨は雲から落ちてくる水滴のことです。植物が育つためにとても大切なものです。
sunset
A1The time in the evening when the sun disappears from view below the horizon. It refers to both the specific time of day and the colorful sky that often accompanies it.
overcast
A1An overcast is a condition where the entire sky is covered with clouds and no sun can be seen. It describes a grey and dull sky that often happens before rain or during cold days.
blizzard
B2A severe snowstorm characterized by very strong winds and low visibility over an extended period. In a metaphorical sense, it refers to an overwhelming or confusing mass of something that arrives suddenly, such as data or paperwork.
chill
A1A mild but unpleasant feeling of coldness in the air or in the body. It often describes the temperature when it is cool enough to make you shiver but not freezing.
snowy
A1Describes a place or time that is covered with snow or has a lot of snow falling. It is often used to talk about winter weather and the white appearance of the ground.
