What is the function of “a” and “the”when use in the sentence? When is the right time to use “The” and “a”?

Question by notsniw: What is the function of “a” and “the”when use in the sentence? When is the right time to use “The” and “a”?
If “a” and “the” are articles, What part of speech do they belong? and if they belong to a specific part of speech, when is the proper time to use them?

Best answer:

Answer by mimi
as you said, “a” and “the” are articles.
but the “a” article is used for indefinite objects and singular ones. eg: a book. that means anyone.

but when you use “the”, that shows that you are talking about something definite: “the book”, only this one and not another.
“the” is also used for plural definite purposes.
when the plural is indefinite, you don’t add any article: “books”.

hope that helped.

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