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.
valid
Adjective
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If something is valid, it is correct, appropriate, and acceptable.
I'm sorry sir, your driver's license is not valid.
I think we should listen to her. She makes a valid argument.
To log in, you need a valid password.
path
Noun
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A path is a way to get to a place. It is like a small road, often made of dirt.
That path leads into the woods.
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A path is the way something moves.
The planets follow an elliptical path.