Indefinite Articles: Definition, How to Use, Exceptions, Practice Questions with Answers

English Articles

Poornima Sharma
Updated on Jul 1, 2025 13:44 IST

By Poornima Sharma

The indefinite articles in English Grammar are "a" and "an". Used before singular, countable nouns when the noun is not specific, "A” is used before words that begin with a consonant sound, while "an" is used before words that begin with a vowel sound. For example:

  • I need a book.
  • She is a teacher.
  • I want to eat an orange.
  • I saw an interesting show last Sunday.

A and an are important parts of English sentence structure. While they are easy to understand, there are few exceptions and special cases that students should keep in mind while using these indefinite articles in English language. This page will help students cover all such important topics about indefinite articles along with some practice questions in the end. It will also tell you the difference between Definite Articles and Indefinite articles in English grammar. 

Also Read:  Articles in English

Table of content
  • What is an Indefinite Article?
  • Definition of an Indefinite Article
  • Types of Indefinite Articles
  • Rules and Structure of Indefinite Articles
  • Special Cases and Exceptions in Indefinite Articles
  • Definite Article v/s Indefinite Article
  • Preparation Tips to Master Indefinite Articles
  • How to Identify Indefinite Article in a Sentence
  • Common Errors to Avoid in Indefinite Articles
  • Best Books to Study Indefinite Articles
  • Examples of Indefinite Articles
  • Practice Questions with Answers:
  • FAQs on Indefinite Articles
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What is an Indefinite Article?

An indefinite article is a type of determiner used before a singular, general or unspecified version of a noun.

A is used for words that begin with a consonant sound. For example:

  • I want a plate.
  • She is searching for a ball.

An is used for words that begin with a vowel sound (a, e, i , o, u). for example:

  • An apple a day keeps the doctor away.
  • She is scared to travel in an airplane.

Also Read: 

Verbs in English

Punctuation Rules in English

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Definition of an Indefinite Article

According to the Oxford dictionary, an Indefinite article is “used before countable or singular nouns referring to people or things that have not already been mentioned.”

In the Cambridge Dictionary, the indefinite article is defined as the “grammatical term for the words "a" and "an" in English, or words in other languages with a similar function. These articles are used before nouns to indicate that the noun is general or not specifically identified.”

Collins Dictionary says, the indefinite articles are defined as "a" and "an". They are used before singular, countable nouns when referring to something not specific or previously mentioned. The choice between "a" and "an" depends on whether the following word starts with a consonant or vowel sound, respectively.”

It is pronounced as:

/ə/, strong form  /eɪ/

 /ə/, strong form  /eɪ/

Also Read: 

 

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Types of Indefinite Articles

In English grammar there are two types of indefinite articles:

  • A: Used before singular nouns that begin with a consonant sound.
  • AN: Used before singular nouns that begin with a vowel sound.

Let’s take a look at some examples: 

  • "I saw a cat in the park." (general cat, not a specific one)
  • "He is an architect." (general profession, not a specific architect)
  • "She needs an umbrella." (general, unspecified umbrella)
  • "Please bring me a chair." (general chair, not a specific chair)

Types of Indefinite Articles

Also Read: Types of Adjectives in English

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Rules and Structure of Indefinite Articles

Following are the rules and use cases of indefinite articles:

  1. Use ‘a’ when the word starts with a consonant, or before words starting in u and eu when they sound like you. Use an when the next word starts with a vowel or with a mute ‘h’. For example:
  • She saw a big elephant in the park.
  • She needs an umbrella as it’s raining outside.
  • It is an honor to be here.
  • She is a European.

 

  1. The indefinite article is used to refer to something for the first time or to refer to a particular member of a group or class. For example:
  • Would like to have a drink?
  • Did you get a job?

 

  1. Use ‘a’ with names of jobs. For example:
  • She wants to be a doctor.
  • Joe is a dancer.

 

  1. Use ‘a’ and ‘an’ with nationalities and religions in the singular. For example:
  • Mary is a catholic.
  • Ram is a Hindu.
  • He is an Englishman.

 

  1. Use a with the names of days of the week when not referring to any particular day. For example:
  • I was born on a Monday.
  • Could we go for the movie on a Sunday?

 

  1. Use a to refer to an example of something. For example:
  • The dog had a big tail.
  • It was a very beautiful day.

 

  1. Use a with singular nouns after the words 'what' and 'such'. For example:
  • What a day it was!
  • She is such a beautiful girl.

Also Read: 

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Special Cases and Exceptions in Indefinite Articles

While in most cases, ‘a’ is used words starting with consonants and ‘an’ is used words beginning with vowels, there are some special cases too. Let’s have a look at some such exceptions:

Words starting with "u" that sound like "yu" 

When the letter "u" is pronounced as "yu" ("you"), the article "a" is used. For example:

  • This is a good university.
  • Her company is a unicorn in a short span.

 Words starting with "eu" that sound like "yu"

When "eu" is pronounced as "yu", "a" is used. For example:

  • She is a European.
  • This is a Euro note.

Words starting with "one"

"One" is an exception because the "o" sound is pronounced as the consonant "w". For example:

  • Look at a one-eyed dog!
  • She is a one-man army!

Silent "h"

When the "h" is silent at the beginning of a word, the following vowel sound dictates the use of "an". For example:

  • I waited for an hour.
  • Joy is an honest boy.

Abbreviations

If an abbreviation starts with a vowel sound (even if the first letter is a consonant), "an" is used. For example:

  • She holds an MBA degree.
  • Mike is an FBI agent.

Also Read: 

Moods in English

Direct and Indirect Speech in English

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Definite Article v/s Indefinite Article

In English grammar, articles are words that precede and modify nouns. They indicate whether a noun is specific or general.

The definite article, "the," refers to a specific, known noun, while the indefinite articles, "a" and "an," refer to a general or unspecified noun.

Let’s compare some examples for better understanding:

Definite Article (The)

Indefinite Article (A, An)

Please pass me the plate. (Referring to a specific plate)

Can you pass me a plate? (Talking about plate in general)

I read the book you recommended." (Referring to a specific book)

She is reading a book. (giving a general info)

The apples are red and juicy. ((Referring to a specific bunch of apples)

An apple a day keeps the doctor away. (Apple starts with a vowel, hence an is used)

Also Read: 

English Composition

Para Jumbles in English Language

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Preparation Tips to Master Indefinite Articles

Articles are vital parts of English grammar that significantly impact the meaning of a sentence. By correctly using definite and indefinite articles, you can communicate and write more precisely and score good marks. Here are some preparation tips to master the use of indefinite articles:

  • First and foremost, understand the meaning and concept of indefinite articles. Post that, how and where are they used, will be clearer.
  • Read regularly. Expose to well-edited text can reinforce correct usage of articles in English language.
  • Speak and write a lot. Practice using articles in speaking and writing exercises.
  • Engage in Role-playing, storytelling sessions, and peer correction exercises for better understanding and expertise in the topic.
  • Use educational apps, games, online books, and other digital platforms, that include exercises on articles. They are more engaging platforms for young learners.

Also Read: 

Preparation Tips for English Verbs

Preparation Tips for English Pronouns

  •  

 

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How to Identify Indefinite Article in a Sentence

Look for following things in a sentence to identify indefinite articles in English sentences: 

Consonants/Vowels: "a" is used before words starting with a consonant sound and "an" before words starting with a vowel sound

Non-Specific Nouns: They refer to a general noun, not a specific one.

Singular Nouns: They are used with singular nouns.

Examples:

  • She lives with a cat.
  • We should eat an apple every day.
  • He is an honest man. (read the exceptions above in the page)

Also Read: 

Read more
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Common Errors to Avoid in Indefinite Articles

Students can avoid following errors for the correct usage of indefinite articles in English:

Using "a" before vowel sounds and "an" before consonant sounds 

This is a common mistake. Students can focus on the sound of the word, not just the spelling, for the correct usage of indefinite articles. For example:

  • She is waiting since an hour. (an because it sounds as ‘a’ with silent h)
  • This is a good university. (an because the letter "u" is pronounced as "yu")
  • She likes an apple. (an with a vowel sound)
  • Can you pass a glass? (a with a consonant sound)

Using indefinite articles with plural or uncountable nouns

"A" and "an" are only used with singular countable nouns. For example:

  • I have a book. (correct)
  • I have a books. (incorrect)
  • I need water. (correct)
  • I need a water (incorrect)

Omitting articles before singular countable nouns

If you're referring to a singular, countable noun that is not specified, you need to use "a" or "an". For example:

  • I saw a movie. (correct)
  • I saw movie. (incorrect)

Incorrectly using articles before job titles and public places

Use "a" or "an" before job titles (e.g., "I am an engineer") and not specific, unique position. For example:

  • He is an engineer. (correct)
  • He is the CEO. (Correct)
  • He is a CEO. (Incorrect)

For public places, definite article "the" is generally used instead of indefinite article.

  • Let’s go to the theatre. (correct)
  • Let’s go to a theatre. (incorrect)

Overusing articles before uncountable nouns

Uncountable nouns like "information," "advice," or "furniture" generally don't take indefinite articles.

  • She gave me all the information. (correct)
  • She gave me all a information. (incorrect)

Also Read: 

How To Use Subject and Predicate in English

 

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Best Books to Study Indefinite Articles

Following are some books students can refer to for studying indefinite articles: 

Books

Author

Practical English Usage

Michael Swan

Mastering A, An, The: English Articles Solved

Douglas Porter

The Article Book: Practice Toward Mastering A, An, The

Tom Cole

These books provide clear explanations of grammar rules, including those related to articles. They focus on the use of articles and emphasize practice, which is crucial for solidifying understanding of article usage.

Also Read: 

Best Books for English Active and Passive Voice

Best Books for English Synonyms

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Examples of Indefinite Articles

Here are some examples with different use cases for revision and further understanding of the topic.

Examples

Description

She is searching for a ball.

Talking about a single ball in general.

I want a plate.

Talking about plate in general. Also, plate starts with a consonant.

An apple a day keeps the doctor away.

Apple starts begins with a vowel sound.

She is scared to travel in an airplane.

Airplane starts begins with a vowel sound.

It is an honor to be here.

An with words with a mute ‘h’

She is a European.

A with words starting with u and eu

She wants to be a doctor.

A with job names

Meera is a Hindu.

'a’ and ‘an’ with nationalities and religions in the singular

I was born on a Monday.

a with the names of days of the week in general

The dog had a furry tail.

A used with an example of something.

She is such a nice girl.

A with words 'what' and 'such'

Also Read: 

 

 

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Practice Questions with Answers:

Exercise 1: Fill in the blanks with a/an.

  1. There is ____ green English book on the desk.
  2. She's reading _____ old comic.
  3. They've got ____ idea.
  4. He is drinking ____ cup of coffee.
  5. The girl is ____ pilot.

Answers:

  1. A
  2. An
  3. An
  4. A
  5. A

Exercise 2: Choose the right article and complete the sentence:

  1. ____ children are playing in the park (the/an)
  2. I would like to have ___egg in the breakfast. (the/an)
  3. I want ____ honest review on the book. (the/an)
  4. I like ___ dress on me. (the/a)
  5. I want ____ plate to eat. (the/a)

Answers:

  1. The
  2. An
  3. An
  4. The
  5. A

Also Read: 

English Parts of Speech

 

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FAQs on Indefinite Articles

Frequently Asked Questions (FAQs) on Indefinite Articles in English Grammar. 

Q&A Icon
Commonly asked questions
Q:  

What is the difference between Definite and Indefinite article?

A: 

In English grammar, articles are words that precede and modify nouns. They indicate whether a noun is specific or general. The definite article, "the," refers to a specific, known noun, while the indefinite articles, "a" and "an," refer to a general or unspecified noun.

Q:  

What are the best books to study Indefinite articles?

A: 

Following are some books students can refer to for studying indefinite articles: 

Books

Author

Practical English Usage

Michael Swan

Mastering A, An, The: English Articles Solved

Douglas Porter

The Article Book: Practice Toward Mastering A, An, The

Tom Cole

 

Q:  

What are the rules for Indefinite articles? 

A: 

Use 'a' when the word starts with a consonant, or before words starting in u and eu when they sound like you. Use an when the next word starts with a vowel or with a mute 'h'. For example:

Ø  She saw a big elephant in the park.

Ø  She needs an umbrella as it's raining outside.

Ø  It is an honor to be here.

Ø  She is a European.

The indefinite article is used to refer to something for the first time or to refer to a particular member of a group or class. For example:

Ø  Would like to have a drink?

Ø  Did you get a job?

Use 'a' with names of jobs. For example:

Ø  She wants to be a doctor.

Ø  Joe is a dancer.

Read all the rules in the page above.

Q:  

Are there any exceptions in indefinite articles?

A: 

Words starting with "u" that sound like "yu"

When the letter "u" is pronounced as "yu" ("you"), the article "a" is used. For example:

·       This is a good university.

·       Her company is a unicorn in a short span.

 Words starting with "eu" that sound like "yu"

When "eu" is pronounced as "yu", "a" is used. For example:

·       She is a European.

·       This is a Euro note. 

Words starting with "one"

"One" is an exception because the "o" sound is pronounced as the consonant "w". For example:

·       Look at a one-eyed dog!

·       She is a one-man army!

Silent "h"

When the "h" is silent at the beginning of a word, the following vowel sound dictates the use of "an". For example:

·       I waited for an hour.

·       Joy is an honest boy.

Abbreviations

If an abbreviation starts with a vowel sound (even if the first letter is a consonant), "an" is used. For example:

·       She holds an MBA degree.

·       Mike is an FBI agent.

 

 

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