Within the closed class, there are articles, which in English, always accompany a noun. An article that is definite indicates that the noun it is accompanying is a specific noun that is to be set a part from all other nouns of the same name. For example in the sentence: "The boy got the basketball", The is specifying a particular boy, not just a boy. “A” and “an”, are indefinite articles in English.
- Crystal, David (1999) The Penguin Dictionary of Language. London: Penguin.
- Matthews, P. H. (1997) The Concise Oxford Dictionary of Linguistics. Oxford: Oxford University Press.