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.
poor
Adjective
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Someone who is poor has little or no money.
He is very poor.
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Something that is poor is bad quality.
The painting was a poor job.
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You use poor before someone's name or a pronoun when you feel bad for that person.
Tom is all alone. Poor Tom!
Oh, poor you! I can't believe that happened.
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The poor are a group of people who have little or no money.
This work is to help the poor.
policy
Noun
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A policy is an official rule or idea that explain how to act in certain situations.
The college policy is that teachers may not have any sexual relationship with students.
The government is suggesting a significant change in economic policy.
In at least one case there was a deliberate policy decision not to involve the police.
The policy at the movie theater said we should turn on phones off and be quiet, during the movie.