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.
crack
Verb
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When something cracks it breaks along a line, maybe not a straight line. It might break into two pieces, or it might break but the two pieces are still attached.
She cracked an egg and put the inside of the egg into a bowl.
crack
Noun
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A crack is the line where something is breaking.
There is a crack from the edge of this plate to the middle. It will break soon.
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A loud sound like the sound of something breaking.
It was raining, and she saw a flash of lightning and heard the crack of thunder.
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A strong, fairly cheap form of cocaine; crack often comes in the form of a rock and it is usually smoked in a crack-pipe.
"I wouldn't use it, if I was going to use it I can afford real cocaine. Crack is wack." -