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.
double
Adjective
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A double door, window, etc. includes two of the same kind.
We opened the double door to let the piano come in.
Call me at 519-double three double seven.
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A double accident, murder, etc. is two events that happen together or are somehow connected.
With the double wedding, Sunday was the busiest day of the year.
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If something is double, it is 100% bigger than something else.
The new computer was double the cost of the old one.
I'll have a double coffee.
Usually we see about seventy people a day, but yesterday it was double.
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A double thing is for two people.
They slept together in a double bed, while James slept in a single in the other room.
double
Verb
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If something doubles, it grows by 100%.
The price of gold has almost doubled in the last month from $407 to $792.
We need to double the number of people buying it.
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If something doubles as something else, it has both roles.
The kitchen doubles as our dining room.
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If something doubles up/over, it folds in half.
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If two people double up, they stay or work together.
double
Noun
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Somebody's double is another person who looks very similar to them.
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In baseball, a double is a hit that allows the runner to move to second base.