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.
prairie
—
noun
a treeless grassy plain
home
Noun
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Where a person lives. Usually, where people keep their things that they are not carrying, and where they sleep.
home
Preposition
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If you go home, you go to the place where you live.
He brought the money straight home to his mother.
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If you are home, you are in the place where you live.
I'm home all evening, so give me a call.
companion
Noun
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A companion is somebody who you spend time with, usually because you enjoy being with them.
In some places, it's best to travel with a companion.
Because she is blind, the dog is her constant companion.
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If mathx/math is a companion to mathy/math, mathx/math and mathy/math go together.
Pain is a natural companion to art.
Scientists noticed that this normal star circles an unseen companion.