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.
regulator
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noun
any of various controls or devices for regulating or controlling fluid flow, pressure, temperature, etc
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noun
an official responsible for control and supervision of a particular activity or area of public interest
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noun
(= governor)
a control that maintains a steady speed in a machine (as by controlling the supply of fuel)