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.
proper
Adjective
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The proper way, place, use, etc. is the right one.
What is the proper way to write a letter?
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If something is proper, it is polite or acceptable.
It's not proper for you to live alone like this.
She was a very proper young lady.
Why don't you get a proper job at a good company?
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The mathx/math proper is the main or important part of mathx/math, not the parts near it.
We stayed in a village and only went into the city proper during the day.
style
Noun
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A style is a specific look, design, or way of dressing or acting.
I don't understand why the styles in fashion magazines are always changing.
We have a new manager, but her style is much more friendly than the old guy.
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A style is a traditional or legal term referring to a person who holds a title or post.
He styled himself the Count of Monte Cristo.