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.
possible
Adjective
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If something is possible, it is able to be done; doable; not impossible.
Life on other planets is possible.
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If something is possible, it is acceptable.
Zero is one possible solution.
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If something is possible, it is likely.
Is that possible?
answer
Noun
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An answer is something that someone says after another person asks (says) a question.
The answer to your question is "no".
Question: "How old are you?"
Answer: "I'm 12 years old."
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An answer is the solution to something.
I found the answer to the mathematics exercise immediately.
answer
Verb
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To respond.
He answers all my questions.