Englishfor English speakers
for
Preposition
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shows that something belongs to something else, or has a specific function
This cake is for you.
This is a net for catching fish.
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For is used to show the reason for something
He was angry, for he had never been called such terrible names before.
for
Subordinator
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For introduces a clause with a subject and a to-infinitive
It's not good for you to be too relaxed.
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.