INDEFINITE ARTICLES

1. EXAMPLE

1.1. A Dog

1.2. A Book

1.3. A ball

2. A

2.1. Use “a”, “and” only with singular nouns

2.1.1. 1st Sitting

2.1.2. 2nd Sitting

2.1.3. 3rd Sitting

2.2. Video

3. According to the Oxford Dictionaries it is a determiner that introduces a noun phrase. a|an are considered indefinite articles and they are used to introduce new concepts into a discourse.

4. AN

4.1. Use “an” with words that start with a vowel sound

4.2. Vídeo

5. EXAMPLE

5.1. An Ant

5.2. An Ice Cream

5.3. An Hour