The zero article

The zero article - is used in the following cases:

Explanation Example
Before a singular countable noun when it is used to address someone What is the matter, Doctor?
Don't worry, Mother. I will be O.K.
Before plural countable nouns, when they are used to represent all individuals belonging to a class Elephants are big animals.
Oranges have vitamins in.
When a plural countable noun denotes a number of indefinite examples There are people in the street.
Students often stay at colleges.
When a plural countable noun occurs after be or become The Browns are engineers.
Mrs. Smith's daughters became actresses.
Before abstract nouns such as: beauty, truth, etc. Beauty is truth.
Before the names of materials such as: wood, glass, etc. Chairs are made of wood.
This vase is made of glass
Some of these nouns may be used as countable nouns and then they are preceded by the indefinite article a wood (i.e. "a small forest")
a glass (i.e. "a mirror" or "a drinking vessel")
There is a wood not far from my cottage.
I got a glass as a birthday present.
Before such uncountable nouns as money, milk, etc.: Lily needs money.
One should drink milk.
These nouns may be preceded by such phrases as: some, a lot of, etc. Lily needs some money.
One should drink a lot of milk.
In exclamations, when uncountable nouns or plural countable nouns are used What dirt!
What flowers!
except:
What a waste!
What a pity!
Before few and little which imply scarcity and lack respectively I have few friends. (i.e. ‘almost no friends’)
I have little sugar. (i.e. ‘almost no sugar’)
When a singular countable noun is used after be and become and it means a unique profession John Kennedy was President.
Karol Wojtyla became Pope.
When a noun occurs after turn He turned musician and made a great career.
He turned spy and was imprisoned.
When a noun refers to an institution which is considered to be the only one of its kind When will parliament begin its session?
When does school end?
Before two or more nouns when they refer to a human couple, or to a pair of inanimate objects Father and mother went to the cinema.
She was studying day and night before her final exams.
When a noun is used in notes, signs, newspaper headlines, telegrams, etc. Private road.
Design flaw feared.
Before some nouns of which there is only one Heaven
Hell
Paradise
Before names of seasons, months, and days of the week summer
April
Sunday
Before a noun preceded by a pronoun or an adjective my shirt
my white shirt
Before names of meals, except when these are preceded by an adjective: We have breakfast at eight.
He gave us a good breakfast.
The article is also used when it is a special meal given to celebrate something or in someone's honour I was invited to dinner. (in the ordinary way)
I was invited to a dinner given to welcome the new ambassador.
Before the following nouns, when these places are used for their primary purpose bed
goal
school
court
church
hospital
sea
prison
college
market
university
We learn at school.
When he became seriously ill, he was taken to hospital.
but:
My bus stops opposite the school.
Yesterday, I was allowed to go to the hospital to see my cousin.
We go to sea as sailors. to be at sea = to be on a voyage as passengers or crew
  But to go to or be at the sea = to go to or be at the seaside. We can also live by/near the sea.
the can be omitted when speaking of the subject's or speaker's own town; We go to town sometimes to buy clothes.
We were in town last Monday.
Before personal names Professor Smith
Adam Brown
Before names of festivals Christmas
Easter
Before names of certain periodicals Time
Newsweek
Before names of some organisations British Rail
British Airways
Before names of some buildings, bridges, and streets Welbeck Mansion
London Bridge
Regent Street
Before man and woman to denote "mankind" and "womankind": Man constantly changes his natural environment.
continents Africa
South America
countries, counties, states Poland
Oxfordshire
Vermont
cities, towns and villages New York
Tokyo
Wilkowyje
single islands unless their names contain a preposition Malta
Corsica
Crete
Long Island
The Isle of Wight
The Isle of Man
lakes Lake Baikal
Lake Victoria
single mountains unless their names contain a preposition Mount Everest
Mount Blanc
The Mountain of the Seven Sights
streets Oxford Street
Broadway
In a number of parallel structures day by day
from dawn to dusk
hand in hand
from beginning to end
face to face
from west to east
Before an abstract noun which is used in a general sense Some people like risk.
Before home when it refers to the home of the speaker or the listener It's late I have to go home.
If you don't feel well, you should stay at home.
Before last and next when they refer to proximate days, weeks, months, etc. I met him last week. (i.e. "the week before the present one")
I hope to see you next week. (i.e. "the week after the present one")
Before a gerund when the action/state denoted by the gerund is not identified Mrs. Thompson likes cooking.