Indefinite Article

1. This article is used before the count nouns, provided that the accounting names appear in singular. the articles are: "A" and "An".

2. A: It is used before consonants, and vowels are pronounced as a diphthong. Examples: a student, a pencil, a table, a picture, a computer.

3. An: It is used before vowels (vowel sounds), or a h (mute). Examples: an hour, an apple, an elephant, an ant.

4. The indefinite article is also used in some expressions of frequency, speed or price. Examples: five times a week, sixty kilometres an hour.