INDEFINITE ARTICLES A/AN

1. A

1.1. The article A is used before singular, countable nouns which begin whit consonant sounds.

1.1.1. examples:

1.1.1.1. he is a tecaher

1.1.1.2. i saw a bear at the zoo

2. AN

2.1. the article AN is used before singular, countable nouns which begin whit vowel sounds

2.1.1. examples:

2.1.1.1. he is an actor

2.1.1.2. i saw an eagle at the zoo.