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.
pile
Noun
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A pile is a lot of things with some on the bottom and more on top.
There was a neat pile of sheets and blankets at the foot of each bed.
He found his phone under a pile of clothes.
The children spent the afternoon jumping into leaf piles.
in California has many huge rock piles.
She reached for the next piece of paper on the top of the taller pile.
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A pile is a long, strong post to support something like a bridge or building.
pile
Verb
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If you pile something somewhere, you put a lot of it there.
The table that was piled high with all sorts of fruit, cheese, cakes, and sweets.
She piled the books on the corner of the desk.
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If something piles (up), there is more an more of it.
I listen to the snow piling on the roof.
When I was away the work kept piling up.
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If something piles on top of something else, it is added to it.
The changes, piled on top of the problems at home were too much.
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If people pile on, they attack somebody who is already being attacked.
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If people pile in(to) a car, or some other small space, they get in quickly.
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If people pile out of a car, or some other small space, they get out quickly.