Englishfor English speakers
in
Preposition
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Used to show that something is inside something else.
The cat is in the box.
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Used to show that someone is at home, or is available.
Is John in?
The Doctor is now in.
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Used to show movement towards the inside.
The rain came in through the window.
element
Noun
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An element is one part of something bigger, such as a plan, an engine, or a business.
He's the best salesman on our team, but he's only one element in our success.
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An element is one basic kind of substance, such as iron (Fe) oxygen (O) or sodium (Na).
Water is made up of two elements: Hydrogen and Oxygen.