a - you use a when the following word begins with a consonant sound.
*...a piece, ...a good teacher, ...a language class.
an - you use an when the following word begins with a vowel sound.
*...an apple, ...an example, ...an early train.
the - goes with singular countable nouns, singular uncountable nouns, and plural nouns.
(when something is referred to for a second time)
* Have you read the books I brought to you last month?
* Did you put the water in the fridge?
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