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.
common
Noun
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Common is what is considered good for society, it is the good that society shares.
common
Adjective
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Mutual; shared by more than one.
The two teams have the common goal of winning the game.
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Occurring regularly or frequently; usual.
It is common to find sharks off this coast.
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Found in large numbers or in a large quantity.
Sharks are common in these waters.
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Simple, ordinary or vulgar.
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Not special.