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.
agree
Verb
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When two people agree about something, they have the same ideas. They both think the same things are true.
We agree that it will probably rain this afternoon.
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When two people agree to do some things, they say something like "if you do this, then I will do that." After they agree, then they must do the things they said.
We agreed to pay him $100 to paint the walls.