Englishfor English speakers
chairman
Noun
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A chairman is the person who controls a meeting or an organization.
Alan Eastwood is the former chairman of the Police Federation.
Mr Saatchi will continue as chairman but is being replaced as chief executive by Robert Louis-Dreyfus.
Mr Chairman, ladies and gentlemen I'd like to present to the board the results of our research.
of
Preposition
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Made using.
It is a house of cards.
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.
company
Noun
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A company is an organization for doing work for money.
He works for a big company.
I own this company, so it's a problem for me if people don't buy what we make.
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Company is people who are visiting other people; people who are in other peoples' house so that they can talk to the other people, or people who are walking with other people or being somewhere with other people.
I can't talk to you on the phone right now, because I have company. (people in the house.)
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When someone keeps someone else company, they stay with the person.
Will you keep me company while I go to mail this letter?
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A company is a unit of an army, it usually consists of two or three platoons to form a battalion.