I have always believed that articles (a/an, the) are a special type of adjective.. In watching a TV show recently (Smarter than 5th Grader) - A question was - "How many adjectives are in the following sentence: "Sierra ran down the hill."? - They claimed the answer is 'zero'! I would have said 'one'. Who is correct?
I suspect that this question should be closed as general reference, as a search for "english parts of speech" turns up a decent variety of reasonably authoritative references.
For example, according to wikipedia, the major parts of speech are:
- Open word classes:
- verbs (except auxiliary verbs)
- Closed word classes:
- auxiliary verbs
- determiners (articles, quantifiers, demonstrative adjectives, and possessive adjectives)
- measure words
- adpositions (prepositions, postpositions, and circumpositions)
- cardinal numbers
You may note that articles are a type of determiner, not a type of adjective. (Although other subclasses of adjective also fall into the determiner category.) Other sources which do not delve so deeply into linguistics (such as about.com, the University of Victoria, etc.) put the articles into their own category, specifying the parts as:
Noun, verb, adjective, adverb, pronoun, conjunction, preposition, interjection, article.