Indefinite article (a/an)
Learn when to use the English indefinite articles a and an, and when to use no article at all, before singular countable nouns, at A1 level.
In this lesson, you will learn when to use a, an, and no article.
By the end of this lesson, you will know:
- when to use a
- when to use an
- when not to use an article
When Do We Use A and An?
We use a and an before one singular countable noun when we are talking about any one thing — not a particular one.
We often use them when:
| Situation | Example |
|---|---|
| talking about something for the first time | I saw a dog in the park. |
| talking about one person or thing | She wants a new phone. |
| saying someone's job | He is a teacher. |
| describing something | It is a beautiful house. |
When we mention the same thing again, we often use the: "I saw a dog in the park. The dog was very friendly." See the lesson on the for more uses.
I bought a book yesterday.
She wants a bicycle.
He saw an elephant.
We ate an orange.
A and an in common expressions
Use a/an to mean per: "twice a week" / "three times a day."
We also say: "have a look" and "have a shower."
Which One Should You Choose?
The choice depends on the sound of the next word.
It does not depend on the first letter.
| Use | Before... | Example |
|---|---|---|
| a | consonant sound | a book, a car, a house, a university |
| an | vowel sound | an apple, an egg, an umbrella, an orange |
Always listen to the sound.
✔ an hour (silent h)
✔ a university ("you" sound)
✔ a one-way ticket / a European country ("w" / "y" sounds)
✔ an MP / an hour-long class
✗ a hour
✗ an university
Most speakers say a historic event because they pronounce the h.
When Do We Not Use A or An?
Do not use a or an before plural or uncountable nouns when speaking in general.
Plural Nouns
Use no article when a plural noun refers to people or things in general:
- “Dogs are friendly.”
- “Books help us learn.”
Uncountable Nouns
Uncountable nouns name things that we do not normally count one by one, such as water, milk, music, and information. When they have this general meaning, they do not normally have a plural form and we use no article:
- “Water is important.”
- “Music makes me happy.”
I like dogs.
Children enjoy games.
Milk is good for you.
Information is useful.
A, An, or No Article?
Use this simple guide.
| If the noun is... | Use... | Example |
|---|---|---|
| singular + consonant sound | a | a car |
| singular + vowel sound | an | an apple |
| plural | no article | Cats are friendly. |
| uncountable | no article | Water is important. |
Nouns That Can Be Countable or Uncountable
Some nouns can be uncountable with one meaning and countable with another. The article depends on the meaning:
| Uncountable meaning | Countable meaning |
|---|---|
| “I drink coffee.” (the drink in general) | “Can I have a coffee?” (= one cup) |
| “We had chicken for dinner.” (the food) | “There is a chicken in the garden.” (one animal) |
✔ a and an are only used with singular countable nouns.
✔ We do not use a or an with plural or uncountable nouns when speaking generally.
Common Mistakes
| ❌ Incorrect | ✅ Correct |
|---|---|
| an university | a university |
| a hour | an hour |
| I like a dogs. | I like dogs. |
| She drinks a water. | She drinks water. |
Quick check
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Quick Summary
| Remember | Rule |
|---|---|
| a | before a consonant sound |
| an | before a vowel sound |
| a / an | singular countable nouns |
| no article | plural and uncountable nouns in general |
Before choosing an article, ask yourself:
Is the noun singular and countable?
- Yes → Use a or an.
- No → Do not use a or an.
Does the word begin with a vowel sound?
- Yes → an
- No → a
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Indefinite Article
27 wordsLast updated October 14, 2026