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.
—
Used to show movement towards the inside.
The rain came in through the window.
religion
Noun
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Religion is when a person or persons believe in a God or Gods.
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Religion is a set of beliefs about a God or Gods.
His religion is Christianity. Mine is Buddhism