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.
low
Adjective
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If cost, value, amount, sound, temperature, etc. is low, it is small.
My pay is very low, so it's hard to live here.
Poor people need low-cost apartments.
The temperature will go down over night and tomorrow it will be lower than it was today.
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If something is low, it (or its top) is close to the ground.
The bridge is too low for the truck to go under it.
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If something is low quality, it is bad.
I bought a low-quality bag and it already has a hole in it.
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If a sound is low, it is small in frequency or quiet.
On the piano, the left hand plays the low notes and the right hand plays the high notes.
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If a person is feeling low, they are not happy.
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.
dirty
Adjective
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If something is dirty, it has dirt on it, or it is not clean.
After playing outside all day, her hands were all dirty.
You shouldn't say damn, shit, and other dirty words.
shame
Noun
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Someone feels shame when they know they did something wrong.
The boy felt shame and gave back the candy he had taken.
shame
Verb
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If you shame someone, you make them feel shame.