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.
button
Noun
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A button is a round object that can be pushed through clothing so that the clothing stays on.
Sarah's sweater doesn't work anymore because the buttons popped off.
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A button is a switch that is turned on by pressing it.
I pressed the button to turn on the television.
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A button is a badge that can be worn of clothing and is put onto the clothing with a pin to hold it in place.
I have a "Vote for Bush" button.
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If a poker player has the button, he is the last person to act on that hand.
button
Verb
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If you button something, you fasten it with a button.
Button up your coat!