When we refer to something for the first time, we use ‘a’. - A nuclear power plant is going to be built in this region., When we refer to something we have already mentioned, we use ‘the’. - A nuclear power plant is going to be built in this region. The plant is expected to employ 100 people., We use ‘/’ with uncountable nouns when they are used as general nouns. - ___ Solar energy is becoming increasingly popular in Australia., We use ‘/’ with plural nouns when they are used as general nouns. - ___ Solar panels absorb sunlight and convert it into electricity., We use ‘the’ with some familiar objects when we think of them as the only one. - Energy from the sun is converted into electricity by solar panels., We use ‘the’ with the names of oceans, seas, rivers and geographical areas. - The Yangtze River is the largest in Asia., We use ‘/’ for academic subjects, such as geography and history. - He is studying ___ environmental science at university., We use ‘a’ with some quantifiers (e.g. a number of). - Hydropower has a number of important advantages., We use ‘the’ with a singular noun to describe a class of things (E.g. an animal species). - The tiger is in danger of extinction.,

Articles (a, the, /): Basic Rules

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