Common expressions without articles

Articles are not used in these expressions:

to school     at school     from school     to/at/from university/college to/at/in/into/from church     to/in/into/out of bed/prison/hospital to/at/from work     to/at sea     to/in/from town     at/from home for/at/to breakfast/lunch/dinner/supper     at night by car/bus/bicycle/plane/train/tube/ boat on foot     go to sleep     watch television (TV)     on TV

Possessives

A noun that is used after a possessive (like John's, America's), has no article.

• John's coat (NOT the John's coat)
• America's economic problems (NOT the America's economic problems)

Grammarians are not always agreed as to the grammatical status of the article in Modern English.
In structural grammars the article is often dispensed with as a separate part of speech and absorbed into the adjective class.

The name "determiners" is then given to closed system items, which, functioning as adjuncts, show their head-words to be nouns. The most central type of "determiner" is that to which we traditionally give the name article.

Article introduces a noun and indicates how specific the noun is.
English has two articles: the definite article "the" and the indefinite article "a" (or "an").

INDEFINITE ARTICLE (A, AN)

Use a (or an) only before singular count nouns.

A (or an) means, approximately, "one." "I saw a cat" and "i saw one cat" describe the same event, but "I saw one cat" emphasizes that there was only one cat, not two.

Use the indefinite article to introduce...

1. Nonspecific, unknown nouns:

• He entered a brown building. 
• There is an apple on the tree.

2. One of a general group:

• A computer can do many things.

A / an are determiners. Determiners are words we use before a noun to show whether the noun is specific or general, singular or plural, etc.

A/an

We use a or an with singular countable nouns only. A and an are indefinite articles. We use them to talk about one of something when we assume that the listener / reader doesn't know which specific thing:

• A car drove past. (= we don't know exactly which car)

The

We use the with countable nouns (singular or plural) and uncountable nouns:

• A man is coming round to fix the television.
• Let's sit on the grass over there.

The is the definite article. We use it to talk about a specific example of something we think is known to both ourselves and the listener / reader:

• The cars were parked illegally in the city centre. (= we know which cars and which city)

When do we say "the dog" and when do we say "a dog"? (On this page we talk only about singular, countable nouns.)

The and a/an are called "articles". We divide them into "definite" and "indefinite" like this:

We use "definite" to mean sure, certain. "Definite" is particular.

We use "indefinite" to mean not sure, not certain. "Indefinite" is general.