Articles in the
English language are the definite article
the and the indefinite articles
a and
an. Use of the definite article implies that the speaker assumes the listener knows the identity of the noun's
referent (because it is obvious, because it is common knowledge, or because it was mentioned in the same sentence or an earlier sentence). Use of an indefinite article implies that the speaker assumes the listener does not have to be told the identity of the referent. In some
noun phrases no article is used.