Articles a/an

1. Article "an"

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

1.1.1. Examples

1.1.1.1. An Orange

1.1.1.2. An arrow

1.1.1.3. An Eagle

1.1.1.4. https://www.youtube.com/watch?v=-jz2DCqHPGM

2. Article "a"

2.1. Use “a”, only with singular nouns

2.1.1. Examples

2.1.1.1. She is a teacher

2.1.1.2. He is soccer player

2.1.1.3. A storm

2.1.1.4. https://www.youtube.com/watch?v=zmR_CYJrz8o