✳️We use in:
⚜to talk about locations within a larger area:
I know my book is somewhere in this room. Can anyone see it?
⚜to talk about workplaces when we see them as a physical location:
She works in an open-plan office. (but we use on when we talk about a farm: I’ve always wanted to work on a farm.)
⚜with class:
He found it difficult to concentrate in class.
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