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.
clockwork
Noun
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If something works like clockwork it works very smoothly and correctly.
The new car worked like clockwork.
orange
Noun
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One of the colors people can see
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A fruit with a thick skin and a juicy inside.
orange
Adjective
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colored orange
The construction workers wear orange shirts so that drivers can easily see them.