Article A and An are used to describe singular noun. A is for singular countable nouns which begin with consonant sounds and An is for singular countable nouns which begin with vowel sound. For example :
- I saw a snake on the tree
- A cat likes to come to my house
- My sister gave me an apple
- An umbrella was used
From the first and second examples ( the words snake and cat ) begin with consonant sounds and the third and last examples ( the words apple and umbrella ) begin with vowel sounds.
We can also use article A before words such as “European” or “university” which sound like they start with a consonant even if the first letter is a vowel.
For examples :
- That is a university which we visited before
- Do you have a euro ?
Those are some rules how to use article A and An