Englishfor English speakers
with
Preposition
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With is used to show the other people or things present when something happened
I went to school with my brother.
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With is used to describe something added to something else
The cat has a collar with a bell on it.
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With is used to show what thing is used to do something
He hit the nail with a hammer.
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Used to introduce non-finite and verbless clauses.
With the children so sick, we weren't able to get much work done.
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.
woman
Noun
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A female human.
My wife is a good woman.