articles a/an

1. We use the article "a" only singular nouns

1.1. ej:An apple fell from the tree

2. article "a"

3. definition

3.1. According to the Oxford Dictionaries it is a determiner that introduces a noun phrase. a|an are considered indefinite articles and they are used to introduce new concepts into a discourse.

4. Destinations

5. article "an"

6. We use the article "an" with words beginning with a vowel sound

6.1. ej: My mom cracked an egg.