Indefinite Articles

1. Rules

1.1. Use a/an with names of jobs.

1.1.1. Example: An Architect, A lawyer

1.2. Use a/an with nationalities and religions in the singular.

1.2.1. Example: An Australian, A Catholic

1.3. Use a/an with the names of days of the week when not referring to any particular day.

1.3.1. I was born on a Thursday, I will come to your home on a Saturday

1.4. Use a/an to refer to an example of something.

1.4.1. It was a very strange car, He has an awesome house

1.5. Use a/an with singular nouns after the words 'what' and 'such'.

1.5.1. What a lovely day!, Such an awesome dinner!

2. "a" Article

2.1. Uses

2.1.1. When the next word starts with a consonant, or before words starting in u and eu when they sound like "you".

2.1.1.1. Example: A book, A hat

3. "an" Article

3.1. Uses

3.1.1. when the next word starts with a vowel (a,e,i,o,u) or with a mute h.

3.1.1.1. Example: An Apple, An octopus