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.
double
Adjective
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A double door, window, etc. includes two of the same kind.
We opened the double door to let the piano come in.
Call me at 519-double three double seven.
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A double accident, murder, etc. is two events that happen together or are somehow connected.
With the double wedding, Sunday was the busiest day of the year.
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If something is double, it is 100% bigger than something else.
The new computer was double the cost of the old one.
I'll have a double coffee.
Usually we see about seventy people a day, but yesterday it was double.
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A double thing is for two people.
They slept together in a double bed, while James slept in a single in the other room.
double
Verb
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If something doubles, it grows by 100%.
The price of gold has almost doubled in the last month from $407 to $792.
We need to double the number of people buying it.
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If something doubles as something else, it has both roles.
The kitchen doubles as our dining room.
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If something doubles up/over, it folds in half.
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If two people double up, they stay or work together.
double
Noun
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Somebody's double is another person who looks very similar to them.
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In baseball, a double is a hit that allows the runner to move to second base.
sharp
Adjective
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Having a cutting edge; not dull.
He has a sharp knife.
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Intelligent or quick to learn.
That girl is sharp.
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Strong in flavor.
That lemonade is sharp.
I would like sharp Cheddar cheese.
sharp
Noun
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A blade, especially a sword used in fencing, with a sharp tip.
Jesse preferred to practice with sharps.
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A sharp is a note that is one half step above the one that is named.