The document discusses the use of articles (a, an, the) in the English language. It explains that the and a/an are the two types of articles, with the being the definite article and a/an being the indefinite article. The definite article is used to refer to specific or particular nouns, while the indefinite article is used for non-specific or non-particular nouns. It provides numerous examples and exceptions to the rules for using articles appropriately.

1. Articles: a/an/the EOI El Puerto 2º CAL Inglés © Rafael Moreno Esteban 2008