A/An

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

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A/An

Grammar

So strange AN expression

Learn about a rarely used, odd-looking, formal expression that seems like bad grammar.

ONE and ONES to replace countable nouns

When we are talking about countable things, we can use ONE or ONES if it is clear what we are talking about.

数えられる名詞をONE または ONES で置き換える

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

Talking about one thing: A/AN or ONE

Usually you can use A/AN or ONE if you are talking about one thing, but in some cases we prefer ONE.

A/AN またはONEの使い方メモ

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。

When to use A/AN not ONE

We use A and AN in some fixed expressions to mean "one".

A/An

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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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