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.
reason
Noun
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A reason to do something is why you do it, or the cause of something.
The low price was the main reason for buying it.
I asked them about the reason why we should go.
The police are looking for the reason for the accident.
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Reason is the ability to think clearly.
It's important to use reason to decide, not emotion.
reason
Verb
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If you reason, you think carefully about something.
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(uncommon) If you reason someone, you persuade using reasoning.
I reasoned my friend into my religion.