Indfinite Articles.

1. In English, the two indefinite articles are a and an. Like other articles, indefinite articles are invariable. You use one or the other, depending on the first letter of the word following the article, for pronunciation reasons. Use a when the next word starts with a consonant, or before words starting in u and eu when they sound like you. Use an when the next word starts with a vowel (a,e,i,o,u) or with a mute h

2. Definition.

3. applications.

3.1. We use an if the following word starts with a spoken vowel.

3.1.1. examples

3.1.2. an aunt an old school an American girl

4. Indifinite Article (an)

5. Mode of use of the indefinite article

6. Indefinite Article (a)

7. Applications:

7.1. We use (a) if the next word begins with a spoken consonant.

7.1.1. examples

7.1.1.1. a table a book a shoe a candy

8. Rules of application

9. With the words like 'umbrella', 'ice cream' and 'apple' you have to use: "an umbrella", "an ice cream" and "an apple"

10. When the word begins with a consonant you must use 'a'. If you use words and phrases such as 'ball', 'glass of water' or 'cup of coffee', it would be 'a ball', 'a glass of water' and 'a cup of coffee'

11. Rules of application