a house

1. Articles a/an

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

1.1.1. Examples

1.1.1.1. An Apple

1.1.1.2. An Ant

1.1.1.3. An Aeroplaine

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

1.2.1. Examples

1.2.1.1. A Pig

1.2.1.2. A Car

1.2.1.3. A Doctor