Advanced Articles

A(AN) can be used like the word "per".

Examples:

• Apples currently cost $1.30 a pound.
• Cheetahs can run 60 miles an hour.
• You want $150 a person for the tour?

Use THE with nouns modified by ranking or ordering expressions such as "the first", "the second", "the third", "the next", "the last", "the previous", "the following", "the penultimate", etc.

Examples:

• This is the fifth day of our conference.
• I'll pay the next time we have dinner.
• Don't forget the following rule.

nglish speakers often use THE plus a singular noun when they talk about or make generalizations about certain topics, including:

• musical instruments (the piano, the guitar, the flute)
• plants (the coconut palm, the saguaro, the baobab)
• animals (the leopard, the elephant, the lowland gorilla)
• inventions (the steam engine, the plane, the light bulb)
• currencies (the dollar, the euro, the yen)
• body parts (the head, the eye, the ear)

Generally, articles are not used with the names of illnesses or diseases.

Examples:

• Dr. Smith visits schools and universities to educate students on AIDS.
• Oncologists are doctors who specialize in treating cancer.
• There are several medications that can be used to treat malaria.

HOWEVER: There are some illnesses which require THE.

• the measles
• the flu
• the mumps
• the bubonic plague

MOREOVER: There are a few health conditions or illnesses which can be used with both A(AN) as well as THE and follow general article use. This category includes most aches, pains, growths, and attacks.

• a cold
• a heart attack
• a stroke
• a wart / tumor / growth / etc.
• a sore throat / sore back/ sore foot / etc.
• a headache / toothache / backache / etc.

THE can be combined with certain adjectives to refer to a group of people such as "the blind", "the elderly", "the rich", "the French", "the Sioux", etc.

Examples:

• He is elderly. Adjective
• The organization helps the elderly. Elderly people

REMEMBER: This is especially important in situations where nationalities or ethnic groups and their languages might be confused. In such situations, THE is used to specify that we are talking about the nationality or ethnic group rather than the language.

Examples:

• I like French. Language
• I like the French. The French people

HOWEVER: When generalizing about nationalities or ethnic groups that end in "-ans", such as "Americans", "Mexicans", and "Hawaiians", THEis not usually used.

Examples:

• Americans watch a lot of TV.
• Germans drink a lot of beer.

Use THE with the names of:

• oceans
• seas
• coasts
• rivers
• swamps
• archipelagos
• collections of lakes (such as the Great Lakes)
• mountain chains
• deserts
• references on the globe (such as the Equator, the North Pole)
• geographic regions (such as the Northwest, the Middle East)
• bridges (except Tower Bridge)
• pagodas
• hotels
• theaters
• museums
• institutes
• skyscrapers
• the Sun, the Moon
• extraordinary works of art or architecture (such as the Mona Lisa, the Colosseum, the Great Wall of China, and the Taj Mahal)

More examples and exercise are on: http://www.englishpage.com/articles/advanced-articles.htm