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.
dark
Adjective
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If something is dark, is has no light.
The cave is very dark.
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If something is dark, it is scary or not pleasant.
World War II was a dark time in world history.
dark
Noun
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Place where there is no light.
Most humans are afraid of the dark.
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Late in the day, especially after sunset.
Go and play with your friends, but be back before dark!
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Darks are clothes that are not light in color.
halo
Noun
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A halo is a circle of light shown around or above the head of a saint or holy person to represent their holiness.
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A halo is a circular band of colored light that is visible around the sun or moon etc., caused by reflection and refraction of light by ice crystals in the atmosphere.