Introduction
The indefinite articles a and an are used before singular countable nouns when the noun is not specific or not yet known to the listener. They refer to any one member of a group, not a particular one.
a+word beginning with a consonant sound
an+word beginning with a vowel sound
- I saw a dog in the park.
- My sister is an engineer.
- Leo ate a banana and an apple on the bus.
A vs An: Sound Rules
The rule is based on pronunciation. Some words start with a vowel letter but a consonant sound, and vice versa. Always listen to the first sound, not the first letter.
| Word | Article | Reason |
|---|---|---|
| university | a university | starts with /juː/ (consonant sound) |
| hour | an hour | starts with /aʊ/ (vowel sound, h is silent) |
| honest | an honest person | h is silent, starts with /ɒ/ (BrE) or /ɑ/ (AmE) |
| European | a European | starts with /jʊ/ (consonant sound) |
| umbrella | an umbrella | starts with /ʌ/ (vowel sound) |
- She is a engineer.She is an engineer.
- It was an university.It was a university.
When to Use Indefinite Articles
| Use Case | Example |
|---|---|
| First mention of something | I bought a car yesterday. |
| Describing what something is | That is a great idea. |
| Jobs and professions | She is a teacher. |
| Rates and quantities | twice a week, £5 a kilo |
| Exclamations with what | What a beautiful day! |
- Sam wants to be a doctor.
- I need an umbrella - it's raining.
- What a surprise!
When NOT to Use Indefinite Articles
Do not use a/an with plural nouns, uncountable nouns, or proper nouns.
- I need a informations.I need information.
- She gave me an advice.She gave me advice.
- They are a students.They are students.
Practice
She is ___ engineer.
It was ___ university.
Which sentence is correct?
What ___ beautiful day!
He wants to be ___ doctor.
twice ___ week
I need ___ umbrella - it's raining.
She gave me ___ advice.
They are ___ students.
That is ___ great idea.
We waited for ___ hour.
It was ___ honest mistake.
She is ___ European.
He has ___ one-year-old daughter.
I bought ___ car yesterday. (first mention)
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