* Preposition: This is the most common usage. It shows the relationship between a noun or pronoun and something else: *The cat is inside the box.*
* Adjective: It can describe something that is located within something else: *The inside of the house was warm and cozy.*
* Noun: Sometimes it refers to the inner part of something: *Let's go look at the inside of the museum.*
It is NOT a verb or a pronoun.
Let me know if you'd like to explore examples of how "inside" is used in different contexts!