Englishfor English speakers
in
Preposition
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Used to show that something is inside something else.
The cat is in the box.
—
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.
extreme
Adjective
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If something is extreme it is very different from normal.
This disease usually causes mild illness, but in exteme cases can cause death.
Few animals can live in the extreme cold of the far north.
extreme
Noun
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An extreme is a situation or idea taken to its limit, especially with two opposites.
When there is a crime, you have a range of choices. At one extreme you can do nothing. A the other extreme, you can kill the person.