SPECIAL CASES IN THE USE OF THE DEFINITE ARTICLE
To decide if you should use the word the, ask yourself these three questions:
1. Is the noun indefinite (unspecified) or definite (specific)?
The general rule states that the first mention of a noun is indefinite and all subsequent references
to this noun are definite and take the:
A man is walking down a road. There is a dog with the man.
The second mention may be a synonym:
Combine butter, sugar and eggs. Add flour to the mixture.
First (indefinite) mention requires a or an for a singular count noun, no article for a plural or
non-count noun. Second mention makes the correct for both count and non-count nouns:
A growing plant must have water and minerals. The plant must also have sunlight. The
minerals must include nitrates and the water must not be saline.
Three special groups of nouns are considered definite in reference even if they have not been
mentioned in the preceding sentence or clause.
a) The first group consists of nouns which refer to shared knowledge of the situation or
context.
For example, in Canada you can say
The Prime Minister will arrive tomorrow
because there is only one Prime Minister in Canada, and so it is clear to whom you are referring.
Similarly, if there is only one hospital in the town, you can say
He's been working in the hospital for two years.
But you couldn't say this in Toronto, where there are many hospitals. You would have to name
the particular hospital in your first reference to it:
He's been working at Toronto General Hospital for two years. He says the hospital is in a
financial mess.
b) The second group consists of nouns referring to unique objects:
e.g., the sun/the earth/the Pope/the sky/the equator
c) Superlative adjectives and unique adjectives form the third group. Because there can be
only one of these (only one of a series can be the tallest or the best or the first), they take the
definite article:
Mexico City is the most populous city in the world.
I enjoyed the first part, but I was disappointed at the end.
She is the principal researcher.
2. Is the noun modified?
a) Premodification: If the noun is preceded by one of the following--
this/that/these/those/some/any/each/every/no/none/my/mine
do not use the definite article.
e.g., the red books/some red books/no red book/his red books/each red book
  
b) Postmodification: if the noun is followed by a relative clause (who/which/that) or a
prepositional phrase (of/in/to...), it is made definite and takes the definite article.
The man who lives next door is Chinese.
We take the regular collection of garbage for granted.
The journey to Vancouver takes three days by train.
No one expected the results that were found.
EXCEPTION: collective nouns take the indefinite article:
a box of matches/a deck of cards/a bar of soap/a herd of cows.
3. Is the noun generic?
Generic reference is used when one refers to a whole group or class, to generalize about all
possible members of a group. There are five patterns one can use:
a) no article PLUS plural count noun:
It's astonishing what gymnasts can do.
b) no article PLUS noncount noun:
Love can cause a lot of suffering.
c) indefinite article PLUS singular count noun:
It's astonishing what a gymnast can do.
[This pattern cannot be used to discuss the location or existence of something/someone.
You cannot say A lion lives in Africa. You must use pattern (a) or (d)].
d) definite article PLUS singular count noun:
It's astonishing what the gymnast can do.
e) definite article PLUS plural nationality noun:
The Chinese have an ancient culture.
Pattern (a) is most common in colloquial English; pattern (d) is frequently use in academic
writing.
Sample Corrections of Sentences
“___ paper based system is very time consuming and error prone.”
Χ A paper based system... Use a if there many such systems and you are referring to one
of them.
Χ The paper based system... Use the if there is only one such system in existence.
Χ Paper based systems... Use the plural if there are many such systems and you are
referring to all of them.
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“EDI can suffer more from ___ breakdown than the manual system.”
Χ EDI can suffer more from a breakdown ... Use a if the type of breakdown has not been
specified or is immaterial.
Χ EDI can suffer more from the breakdown ... Use the only if you have previously
specified which type of breakdown this is.
Χ EDI can suffer more from breakdowns ... Use the plural if there are many types of
breakdowns and all of them can occur.
“Organizations should be ready for ___ increased workload.”
Χ Organizations should be ready for an increased workload. Use a if there will be only
one type of workload change, but you don’t know what kind.
Χ Organizations should be ready for the increased workload. Use the if the increase is
specific.
Χ Organizations should be ready for increased workloads. Use the plural if there are
many types of increased workloads.
“It is ___ museum’s task to explore contemporary culture.”
Χ It is a museum’s task... Use a if you are referring to any museum.
Χ It is the museum’s task... Use the if you are referring to one specific museum.
Special Uses of Articles
a) Proper nouns. Proper nouns, because they are the names of people or places, are already
specific and so do not need to be made more specific by the definite article. So we say “John,”
not “the John,” and “Canada,” not “the Canada.” (There are one or two anomalous usages in
place names: e.g., “the Netherlands,” but “Holland.”) This rule explains why we say “Boyle’s
Law,” not “the Boyle’s Law,” and “Planck’s constant” but not “the Planck’s constant.”
Sometimes, however, a proper noun is used as an adjective, and adjectives do not affect the
decision to use the article with the noun. You must look at the noun in order to know whether or
not to use the definite article.
Χ Japan’s financial problem — Japan is a proper noun. No article.
Χ the Japanese financial problem — Japanese is an adjective. Look at the noun to decide
if there should be an article: problem is general and must be made specific by using
“the.”
Χ Japanese financial problems — Japanese is an adjective. Look at the noun. It is plural,
so refers to all problems in general. No article.
Χ Smith’s book on Japan — Smith is the proper name of the person. No article.
Χ the Smith book on Japan — Smith is used as an adjective modifying the noun book.
Book is general, and must be made specific by using the article. (If the name is
possessive, it is a proper noun. If not, it is acting as an adjective.)
b) Media and communications:
Use a noun PLUS definite article to refer to systems of communication and the mass media, in
contrast to the actual machine of communications. The telephone is the system of
communication; a telephone is the actual physical machine.
The newspapers are all in agreement on the latest financial disaster.
  
[exception: television usually has no article: Did you see him on TV?]
c) Means of transportation:
Use the definite article to refer to the whole transport system, rather than to an individual
vehicle:
How long does it take on the bus?
The subway is quicker.
[if you use the construction "by PLUS means of transport," there is no article: I go by
subway].
d) Forms of entertainment:
To refer to a form of entertainment in general, use the definite article:
I enjoy seeing the ballet.
To refer to a particular event, use the indefinite article:
I saw a good movie last night.
e) Place/object or activity nouns:
Certain nouns refer to either a place/object or to an activity. When they refer to an activity, do
not use the definite article:
ACTIVITY
I go to bed at 11 o'clock.
She went to school for many years.
Many families eat dinner together.
I shower before breakfast.
They are at church.
She is in class.
OBJECT
Don't jump on the bed.
The school was too small.
The dinner was delicious.
The breakfast was delicious.
The church is very old.
The class is in Room 102
f) Directions:
Nouns indicating direction do not take the definite article:
Go two blocks south and turn left.
[exception: nouns indicating political divisions take the definite article:
She is on the left of the party.]
g) Periods of time:
Names of decades, centuries and historic periods take the definite article, as they are a form of
unique reference:
The 1960s were a time of student rebellion.
Prepared by Martine Johnson, International Student Centre, University of Toronto.
Over 50 other files giving advice on university writing are available at www.writing.utoronto.ca