Englishfor English speakers
knowledge
Noun
—
Knowledge is information that you know.
He shared his knowledge with you.
of
Preposition
—
Made using.
It is a house of cards.
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."
—
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.
invention
Noun
—
something that has been invented
Nowadays, we can buy new inventions as soon as they are made.
—
the action of inventing something
—
the ability to invent
It took quite a bit of invention to come up with the toothbrush.