About "in" and "inside"

'In' and 'inside' mean the same when 'inside' is used as a preposition of place.
Examples:
- There are some people in/inside the cafe.
- It was cold in the library. (= inside the building)
- I'll be back within/inside an hour. (= in an hour or less)
- The bird is in/inside the cage.
- What's inside/in the box?

Hello Hailey,

In your example both "in" and "inside" are interchangeable indeed.
They both mean within the building , inside the enclosed space of the building.
However "in" and "inside" are not always or absolutely interchangeable.