When speaking or writing in English, you will notice that there are two forms of the indefinite article, ‘a’ and ‘an’. But when should you use each? In this article, you will explore the key takeaways and definitions of ‘a’ vs. ‘an’, discover 13 rules for using indefinite articles, and find examples of each in sentences.
By the end of this article, you will be confident in choosing whether to use ‘a’ or ‘an’ in your spoken and written English. Additionally, exercises and frequently asked questions will help reinforce your understanding of these useful grammar rules. Learn how to use indefinite articles correctly with clear examples and practical tips.
Key Takeaways
- Use ‘a’ before words that begin with a consonant sound. Examples: a cat, a game, or a university (university starts with a ‘y’ sound, which is a consonant).
- Use ‘an’ before words that begin with a vowel sound. Examples: an apple, an honor, an hour (honor and hour start with a silent ‘h’, making the first sound a vowel ‘o’).
A or An: Understanding the Basic
Defining ‘A’ vs. ‘An’
The words a and an are called indefinite articles. Use them with singular nouns to talk about any one person or thing. The choice between a and an depends on the initial sound of the word, not the first letter.
Using ‘A’ vs. ‘An’
When to Use ‘A’
‘A’ is used before words starting with a consonant sound. Examples:
- A man
- A hat
- A lamp
- A teacher
- A cat
- A book
When to Use ‘An’
‘An’ is used before words starting with a vowel sound. The first sound should be a, e, i, o, or u. Examples:
- An apple
- An egg
- An island
- An article
- An umbrella
- An hour
13 Rules for Using Indefinite Articles: A vs. An
Rule #1:
Use A before words that begin with a vowel sound that resembles ‘y’ or ‘w’. Examples:
- A Euro
- A unicycle
- A union
- A unique
- A united
- A university
- A user
- A unicorn
Rule #2:
Use An before words starting with a silent ‘h’. Examples:
- An hour
- An honor
- An heir
- An heirloom
- An hourly
- An honorarium
- An honesty
- An honorary
When the ‘h’ is pronounced, use A:
- A hamburger
- A hall
- A hat
- A hacksaw
- A horse
- A house
Rule #3:
Use An before abbreviations that begin with a vowel sound. Examples:
- An M.A.
- An M.Sc.
- An M.B.B.S.
- An M.L.A.
- An N.C.C Officer
- An M.Com.
- An M.C.A
- An M.B.A
Rule #4:
Use A or an before a singular noun representing countable objects. Examples:
- He was sitting in a chair.
- She had a bottle in each hand.
- Did you bring an umbrella?
- I would like an apple.
Rule #5:
Use A or an before the names of professions. Examples:
- She is a director.
- Peter is an actor.
Rule #6:
Use a/an with singular countable nouns describing roles or qualities. Examples:
- We all regarded him as a hero.
- I suspect he is a thief.
Rule #7:
Such + a/an + noun or Such + a/an + adjective + noun takes an indefinite article. Examples:
- Such a policy
- Such a long trip
- Such a great teacher
- Such an attractive woman
Rule #8:
Use so + adjective + a/an + noun. Examples:
- So boring a book
- So beautiful an actress
Rule #9:
Few and Little are negative. A few and a little are positive and mean ‘some’. Examples:
- He is young and has little experience of life.
- Sweeten the mixture with a little honey.
- He had few coppers in his pocket.
- I went to spend a few days at the seaside.
Rule #10:
In its original numerical sense of one. Examples:
- Not a word was said.
- Twelve inches make a foot.
- A bird in the hand is worth two in the bush.
- I have a novel with an intricate plot.
Rule #11:
A and an = one thing or person. Examples:
- She works in a hospital.
- There’s a problem with the drains.
- I’ve got a puppy.
- There was a girl sitting next to him.
Rule #12:
Use a and an when you say what a thing or a person is. Examples:
- “Coca Cola” is a beverage.
- Badminton is an indoor game.
- A dog is a domestic animal.
- Mary is a shy girl.
Rule #13:
Use a and an for jobs, etc. Examples:
- She works as a nurse in a hospital.
- John is a fireman.
- I want to be a doctor.
- She is a cashier in a bank.
Note: The indefinite articles aren’t used before plural nouns, proper nouns, abstract nouns, uncountable and material nouns. Examples:
- A dog is a faithful animal.
- Dogs are faithful animals.
A or An: Examples in Sentences
Examples of “A” in Sentences
- She adopted a dog from the shelter.
- He is a university professor.
- It’s a one-time offer.
- She took a European vacation last summer.
- I saw a unicorn in my dream.
Examples of “An” in Sentences
- She ate an apple for lunch.
- It was an honor to meet the author.
- He has an MBA from Harvard.
- They found an old coin in the garden.
- I need an hour to finish this task.
Exercises to Learn the Difference
Decide if the usage of “a” or “an” is correct.
- She has a unique perspective on the matter.
Correct: True - It’s an honor to meet you.
Correct: True - He is a honest man.
Correct: False (Correct usage: an honest man) - I need an umbrella because it’s raining. Correct: True
- That’s an interesting idea.
Correct: True - I saw a elephant at the zoo.
Correct: False (Correct usage: an elephant) - She made an mistake in the calculation.
Correct: False (Correct usage: a mistake) - It takes a hour to get there by train.
Correct: False (Correct usage: an hour) - He gave me a apple from his garden.
Correct: False (Correct usage: an apple) - It was an historic event for the company.
Correct: True (Both “a historic” and “an historic” are used, depending on whether the “h” is pronounced or not.)
A vs. An: Mastering the Basics of English Articles — Practice Quiz
Question 1: Which of the following correctly uses the indefinite article?
Question 2: The choice between 'a' and 'an' depends on the first letter of the following word, not its first sound.
Question 3: He is ___ honest man.
Question 4: Match each noun with the correct indefinite article ('a' or 'an').
Question 5: She works as ___ nurse in a hospital.
You just read about Choosing a or an — try writing 8 sentences with it.