Articles a/an

1. Use of article "a"

1.1. 'A' is used in front of words that begin with consonant sounds ("a sample" or "a model"), even if the consonant sound is made by means of a vowel ("a unit").\

1.1.1. Example:

1.1.1.1. A Boy

1.1.1.2. A Car

1.1.1.3. A Computer

2. Use of article "an"

2.1. 'An' is used in front of words that start with vowel sounds ("an equation" or "an element"), even if the word starts with a mute consonant ("an hour").

2.1.1. Example:

2.1.1.1. An Apple

2.1.1.2. An umbrella

2.1.1.3. An ice cream