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.
going
Verb
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br /
I am going to the beach this weekend.
going
Noun
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The condition of the ground for walking or driving.
The going was very difficult over the ice.
concern
Noun
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A concern is something that you think is a problem or needs attention.
The government expressed its concern at the fighting in Kenya.
Poor sales are causing concern among the owners.
Our main concern now is to make sure that everyone is safe.
There is widespread concern about the approaching storm.
He concern for her children is understandable, given the lack of information.
The changes at the school were quite clearly a matter of great interest and concern among students.
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Concern is a feeling that you want to help somebody.
Her look of concern made him feel better.
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A concern is a business.
XYZ Company is an ongoing concern, and we have no plans to shut it down.
concern
Verb
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If mathx/math concerns mathy/math, mathx/math is about mathy/math.
We have received a letter that concerns the recent sale of the property.
The article is primarily concerned with Dylan's early life.
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If something concerns you, you think it is a problem or needs attention.
The recent losses certainly concern me, but I still think things are looking good.
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You use to whom it may concern at the beginning of a letter when you don't know the name of the person you're writing to.