Englishfor English speakers
the
Determiner
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Used, instead of a, to reference something specific, already known to exist.
Compare "I read a book." and "I read the book."
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Used with a stress, to show that the word following is special.
Are you the John Smith that I went to school with?
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Used with an adjective that acts like a noun to mean all of the people concerned
The poor are always with us.
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Used with superlatives forms of adjectives and adverbs.
You are the best.
chemical
Noun
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A chemical is a basic substance that is used in or produced by mixing elements or other chemicals.
When you burn plastics, you put dangerous chemicals into the air.
The chemical industry in China is producing more and more useful paints, glues, and other products.
chemical
Adjective
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Of or about chemicals.
This test can detect small changes in the chemical composition of water.
wedding
Noun
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A wedding is a special time when two people marry each other.
The wedding was very beautiful.
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Two different things things that have been made into one thing.
Music videos are a wedding of music and television.