Englishfor English speakers
the
Determiner
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Used, instead of a, to reference something specific, already known to exist.
Compare "I read a book." and "I read the book."
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Used with a stress, to show that the word following is special.
Are you the John Smith that I went to school with?
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Used with an adjective that acts like a noun to mean all of the people concerned
The poor are always with us.
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Used with superlatives forms of adjectives and adverbs.
You are the best.
able
Adjective
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If someone is able to do something, he can do it.
I'm busy tomorrow, so I won't be able to see you.
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If a person is able, he is good or skillful at what he does.
She is an able teacher.