English has two types of articles: definite (the) and in (a, an).
a/an to refer to something general or any member of a group. => Use the to refer to something specific or a particular member of a group. When I say specific, I mean something that is known to both the speaker and the listener.
Compare these two examples from the dialogue: 1. I'm shopping for a used car. (Which used car? The speaker is not being specific). 2. The car is still available. (Both the speaker and the listener know which car. We're talking about a specific car now).
When to use the article "a" or "an":
1) Use "a/an" to refer to any member of a group. Examples:
▶ I need a bike. (Any bike - it's not important which one).
▶ If you don't want to be alone, get a dog. (Any dog - it doesn't matter which one).
2) Use "a/an" to describe a person's job, what something is used for, or what type of thing something or somebody is. Examples: ▶ Julia is a lawyer. ▶ This car is a two-door. ▶ She's a nice person.
3) Use "a/an" to speak about the general properties of somebody or something. Examples: ▶ An infant requires a lot of attention. ▶ An unpaid parking ticket.can lead to many problems. ▶ A beagle is a friendly dog.
4) Use "a/an" to describe a person in a general sense (if you don't know who the person is or if his or her individual identity is not important). Examples: ▶ A woman came to the door while you were at the store. (Who? What woman? We don't know). ▶ I'm dating a lawyer.
When to use the article "the":
1) Use "the" when referring to something particular, specific, or unique. Examples: ▶ The moon is bright tonight. ▶ The plane ride to France will take _about 8 hours. ▶ The White House is a must-see if you visit Washington, D.C.
2) Use "the" when your listener knows which person, place, or thing you're referring to. Examples: ▶ Please open the window. (Your listener knows which window - perhaps because you 're pointing to it or because it's the only window in the room). ▶ The radio is still on. (Your listener knows which radio). ▶ What happened to the lawyer you were dating? (You're referring to a specific lawyer - someone you've already been told about).
When to use "the" and when to use no article:
1) Do not use "the" when talking about generalizations with plural or non-count nouns ( for more on non-count nouns, see Lesson 17). Examples: ▶ I like coffee in the mornings. (NOT: the coffee) ▶ Russian is a difficult language. (NOT: the Russian) ▶ Creativity is hard to teach. (NOT: the creativity) ▶ Pandas are popular animals. (NOT: the pandas) Note: When the noun is singular and you're talking about generalizations, you will often use "the." Example: The panda is a much studied animal.
2) Most countries do not take "the": France, Australia, South Africa. Some countries do take "the" - especially those countries consisting of more than one word. Examples: the United States, the Netherlands, the United Arab Emirates, the Czech Republic, the Dominican Republic
3) States, cities, and towns do not take "the" except for "The Hague" and for a few towns in the United States. Examples: California, Paris, Westport, New Haven
4) The names of most lakes, mountains, volcanoes, and islands do not take "the.'' Examples: Lake Superior, Mount St. Helens, Mount Everest
5) Many expressions do not require "the." They include: ▶ at night (but: in the morning, in the afternoon) ▶ at/to college, school, work ▶ Transportation: by car, by foot, by plane, by train ▶ Days of the week and months of the year used with on or in: on Monday, on Tuesday, in December
DO use "the" in these cases:
1) For points of the globe. Examples: the South Pole, the Equator
2) For most geographical regions. Examples: the Midwest, the South, the Middle East
3) For names of oceans, seas, canals, and rivers. Examples: the Mississippi River, the Atlantic Ocean, the Black Sea
4) For forests, deserts, gulfs and peninsulas. Examples: the Gulf of Mexico, the Black Forest, the Arabian Peninsula
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