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A/An

Grammar

Countable or Uncountable

It is difficult to know if a noun is countable or uncountable, but there are some ways to guess and some rules to help you.
Countable Nouns
Uncountable Nouns
Nouns
Grammar
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Grammar

So strange AN expression

Learn about a rarely used, odd-looking, formal expression that seems like bad grammar.
Articles
Adjectives
Advanced
A/An
So
Too
How
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Grammar

ONE and ONES to replace countable nouns

A boy wearing glasses
When we are talking about countable things, we can use ONE or ONES if it is clear what we are talking about.
One
Pronouns
Substitution
Ellipsis
Countable Nouns
Some
Uncountable Nouns
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文法

数えられる名詞をONE または ONES で置き換える

A boy wearing glasses
同じ数えられる名詞を繰り返し使う場合、そしてはっきり同じ名詞だとわかる場合は ONE または ONESに置き換えることができます
One
Pronouns
Substitution
Ellipsis
Countable Nouns
Some
Uncountable Nouns
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Grammar

Talking about one thing: A/AN or ONE

A pair of bee-eaters
Usually you can use A/AN or ONE if you are talking about one thing, but in some cases we prefer ONE.
One
A/An
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文法

A/AN またはONEの使い方メモ

A pair of bee-eaters
何か（数えられる名詞）について話をするとき、たいていA/AN または ONEを使えばOKですが、場合によってはONEがよりよいこともあります。
One
A/An
冠詞
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Grammar

When to use A/AN not ONE

A close up of a clock
We use A and AN in some fixed expressions to mean "one".
A/An
Articles
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Grammar

When to use A or AN

A man throwing a red umbrella in the air
We choose A or AN based on sound NOT spelling.
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A/An
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