The word “the” is a very small but very important word.
We use “the” in the following situations:
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“The” always comes before a noun (the cat, the apple) or noun phrase ( the very interesting conversation)
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“The” refers to one specific example of the object, and the specific example must be clear from the spoken or written context (I bought a book. The book that I bought is lost.)
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“The” can be used with countable or uncountable nouns.
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“The” is called a “definite article.” “A/an” are indefinite articles.