Articles:a,an and the.

Grammar & ESL: Articles—a, an, the
The articles a, an, and the help your readers understand whether you’re using a
noun in an indefinite (general) or definite (specific) way.

Is the noun general? If the noun is general, use “a” or “an.”
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A and an are indefinite articles and are used to indicate a single item.
o Take a pencil. (Take one pencil.)
o I won a hundred dollars. (I won one hundred dollars.)
Do not use a or an with a plural noun.
o Incorrect: “They talked about a good restaurants.”
o Correct, Unspecific reference: “They talked about a good restaurant to visit.”
o Correct, Specific reference: “The talked about the good Italian restaurant on
Main Street.”
Use a as an unspecific reference before a consonant.
o He likes to read a book. (She likes to read any book, not a specific one.)
o That was a funny story. (That was one of many funny stories.)
Use a when the word following it starts with a consonant sound.
o a book, a hospital, a leg, a one-inch pipe, a youth
Use an as an unspecific reference before a vowel sound (a, e, i, o, u).
o an apple, an opera, an eagle, an idea, an SOS (the s here is an es sound)
Words that begin with u or h can have either a vowel or a consonant sound. Make
the choice based on the sound of the first word after the article, even if that word is
not the noun.
o a union, a uniform (use a when the u sounds like the y in you)
o an unbelievable event, an umbrella, a unique umbrella
o an honor, an hour, an honest person
o a hotel, a history book, a historian
o an historian, an historic event (NOTE: words like historic can take either a or
an)

Is the noun specific? If the noun is specific, use “the.”
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Use the as a specific reference to a common noun or something that is one of a kind.
o Give me the book on the table. (identifies a specific book)
o The sun rose at seven o'clock. (identifies something that is one of a kind)
Use a or an to introduce a noun the first time it is mentioned, and then the is used
afterwards whenever the noun is mentioned.
o I bought a sandwich for lunch. I shared the sandwich with my friend.

Most proper nouns do not use an article. However, some do.
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A proper noun names unique person, place, or thing (New York City, Walt Disney,
The United States of America)
o Correct: “I went to New York City.”
o Incorrect: “I went to the New York City.”
An exception is the proper nouns with “of” as part of the name:
o the Fourth of July
o the University of Virginia
o the United States of America
o the President of Mexico
o the Statue of Liberty
Plural proper nouns use the:
o the Chicago Bulls
o the Johnsons
o the Blue Ridge Mountains
A proper noun that names a group (a collective noun) also uses the:
o the Commonwealth of Virginia
o the United Arab Emirates
o the Society of Friends
Some geographical features use the:
o the Gobi Desert
o the Atlantic Ocean
o the Pyramids
o the Amazon
But other geographical features do not use the:
o Lake Superior
o Albemarle County
o Route 29
o Mount Vesuvius

When trying to decide whether to use an article, ask for help
if you need it. Every time you learn a new use of an article,
write it down.

Adapted from the CCNY Writing Center@The Samuel Rudin Academic Resource Center