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.
dressing
Noun
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Something put on a wound to protect it.
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Dressing is a sauce that is put on salads or other foods.
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A bread-based food that is put on or around a turkey.
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Something added to the soil as a fertilizer etc.
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The activity of getting dressed.
He liked dressing up in fancy costumes.
down
Preposition
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Toward the earth, away from the sky.
What goes up on earth must fall down.
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Toward the bottom.
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Towards a smaller price, number, amount, etc.
I'm going to buy a computer once prices go down.
down
Noun
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Down is soft feathers or a covering of soft feathers.
That pillow is full of down.