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Essential ENGLISH GRAMMAR 

Indefinite & definite articles in English

Article usage - the basic rules:
Basically, the rules for using articles in English are quite simple:
*  The definite article shows that a noun is being used in a "defined" or restricted context.
*  When a noun is used in a non-defined or "generalizing" context, in some cases an indefinite article is required, in others no article at all.

a) Principal topics, by theme
Verbs
Verbs : the present tenses
Verbs: expressing the future
Verbs : past tenses
Verbs: conditional structures
Verbs of enabling & permission
Phrasal & prepositional verbs
Irregular verbs
Noun phrases
Count and non-count nouns
Adjectives
Quantifiers
Adjective order in English
The possessive
Relative clauses in English
Conditional clauses in English
Using "since"
Word order in English
Reported questions in English
Miscellaneous
Prepositions and adverbs
b) Other topics, specific points
►Small points sub-index
Glossary of English slang
Language and style 
Word stress in English
The short story of English



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1. The Definite Article

How simple English is !!  There is only one definite article, and that is "the"; the only difficulty is knowing when to use it, and when it is not needed.

Use of the definite article depends on the nature or type of noun that is being used.
As in other languages, nouns in English can be divided into two distinct categories, called:  count nouns and non-count nouns.  
Count nouns are nouns referring to items that can be counted, for example:
 One car, two pencils, three people, four guitarists, five hotels etc.
These nouns can be used in the singular or the plural

In the singular,
count nouns must
   The dog is happy.  (or This dog is happy, etc:  but not: Dog is happy )
   I'm reading the book you gave me.
In the plural, they may require a determiner, depending on context.

Non-count nouns are nouns referring to abstractions, substances or generalizations, or example:
 Oxygen, health, money, heat, astronomy

In the singular,
non-count nouns do not require a determiner.
They can NOT usually be used in the plural.
For more detail see Count & non-count nouns
THE BIG QUESTION concerns plural nouns:

Generalisation or not?

Sometimes it is not easy to decide if a plural noun is being used as a generalization, or in a restrictive context : often the speaker or writer can choose. Look at these two sentences:
 a) London buses are red
 b) The London buses are red.
In example (a), the writer is clearly implying a generalisation on the noun group
 "London buses": All London buses are red.
In example (b), he is referring to a restricted or defined category of the noun:
"buses",  London buses are red, but other buses may be of other colours.
In cases like these, one therefore has a choice; but the choice is not always completely free, as it often depends on context. Is it more important or more logical to imply a generalization, or a limitation? 
Deciding whether it is best to use an article in such cases is a skill that has to be mastered!

2. The Indefinite Article

English has two indefinite articles, a and an
     a
is used before nouns starting with a consonant or a semivowel
     an
is used before nouns starting with a phonetic vowel

Examples:  a dog,  a cat,  an apple,  an orange, an uncle, but a university (because the word university starts with phonetic [ju], which is not a vowel).

Indefinite articles can only be used with count nouns. They are used when a count noun in the singular refers to a non-specified or non defined entity.

Examples:
a) There's a train (= unspecified) coming in 5 minutes. It's the train (= specified) for London.
b) Look! I can see an elephant over there !  (= a non-identified elephant)


There is no indefinite article in the plural. The word "some" is occasionally said to be a plural indefinite article, but really it is a quantifier (like many, few, etc.)

By definition, plural nouns refering to non-specified entities are generalisations, therefore need no article.



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