'A' is placed before a noun that begins with a consonant and the 'u' sound.
For example:
- A lion
- A book
- A temple
- A university
- A European man
'An' is placed before a noun that begins with a vowel and before the silent 'h'.
- An ant
- An umbrella
- An apple
- An honest lady
- An hour
Assess yourself by staged practices