Englishfor English speakers
a
Determinative
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A is used when the following word could be any of a certain type.
Compare "A book I saw on the shelf" and "The book I gave you yesterday".
a
Noun
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A is the first letter of the alphabet.
The letter "a" comes before "b".
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In some schools, an A is a very high grade.
Ron got an A on his earth science test.
rival
Verb
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To oppose or compete with.
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.