A vs An

A1 · BeginnerCommon Grammar Confusions

an hour, a university — the rule is about sound, not spelling.

What you'll learn

  • Use 'a' before a word that starts with a consonant SOUND
  • Use 'an' before a word that starts with a vowel SOUND
  • The rule is about sound, not the letter the word is spelled with
  • 'an hour' — the h is silent, so the word starts with a vowel sound
  • 'a university' — the u is pronounced 'yoo', a consonant-like sound, so it takes 'a'

It's about sound, not spelling

'A' and 'an' are both the indefinite article — they mean the same thing. The choice between them depends entirely on how the following word SOUNDS when spoken, not on which letter it's spelled with. Most of the time this matches the letter (a book, an apple), but a few common exceptions catch learners out.

"a book"
"an apple"
"an hour"
"a university"

Silent 'h': an hour, an honest answer

A handful of English words start with a written 'h' that is not pronounced. Since the word actually starts with a vowel sound, it takes 'an', not 'a'.

"an hour"
"an honest answer"
"an heir"

The 'yoo' sound: a university, a European trip

Some words spelled with a vowel letter (u, e) actually start with a 'y' consonant sound when spoken ('yoo-niversity', 'yer-opean'). Because the SOUND is a consonant, these words take 'a', not 'an', even though they're spelled with a vowel.

"a university"
"a European trip"
"a uniform"
"a one-way street (starts with a 'w' sound)"

Letter names and abbreviations: an MBA, an X-ray

When an abbreviation is read out as separate letter names, the choice of 'a' or 'an' depends on how the FIRST LETTER'S NAME sounds, not on what the abbreviation stands for. 'M' is pronounced 'em' (vowel sound), so 'an MBA'. 'X' is pronounced 'ex' (vowel sound), so 'an X-ray'.

"an MBA (em-bee-ay)"
"an X-ray (ex-ray)"
"a UN meeting (yoo-en)"

Real English

"She waited for an hour before the bus arrived."
"He's studying at a university in London."
"It was an honest mistake."
"They gave her an MBA scholarship."

Watch out

✗She waited for a hour.
✓She waited for an hour.

The 'h' in 'hour' is silent, so the word starts with a vowel sound and needs 'an'.

✗He studies at an university.
✓He studies at a university.

'University' starts with a 'yoo' sound (a consonant-like sound), so it needs 'a', even though it's spelled with a vowel letter.

✗She got a MBA.
✓She got an MBA.

'M' is pronounced 'em', which starts with a vowel sound — so abbreviations follow the sound of the letter's name, not the first letter itself.

Real life — A quick grammar question between friends

"Wait, is it 'a hour' or 'an hour'?"

"'An hour' — the h is silent, so it sounds like it starts with a vowel."

"Oh right! What about 'university'? That starts with a letter u..."

"That one's 'a university' — it sounds like 'yoo', so it's treated like a consonant."

Practice

Exercise 1 · Choose the correct article

Choose the correct article: ___ apple

Exercise 2 · Choose the correct article

Choose the correct article: ___ banana

Exercise 3 · Choose the correct article

Choose the correct article: ___ hour

Exercise 4 · Choose the correct article

Choose the correct article: ___ university

Exercise 5 · Choose the correct article

Choose the correct article: ___ umbrella

Exercise 6 · Choose the correct article

Choose the correct article: ___ honest man

Exercise 7 · Choose the correct article

Choose the correct article: ___ European country

Exercise 8 · Choose the correct article

Choose the correct article: ___ MBA degree

Exercise 9 · Choose the correct answer

What actually determines whether to use 'a' or 'an'?

Exercise 10 · Sort the words into groups

apple
banana
hour
university
umbrella
orange
book
honest

0 / 8 sorted

Quick challenge

Five quick questions to check what stuck.

Question 1 / 5

Score: 0/0

Choose the correct article: ___ elephant

You learned

  • Use 'a' before a consonant sound, 'an' before a vowel sound.
  • The rule is about sound, not the written letter.
  • A silent 'h' means the word takes 'an' (an hour).
  • A 'yoo' sound counts as a consonant, so it takes 'a' (a university).
  • For abbreviations read as letters, the letter's NAME's sound decides (an MBA, a UN meeting).

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