Is 'in' a verb pronoun or adjective?

Answer 1

The word 'in' is a preposition, an adverb, and an adjective.

The word 'in' is a preposition when placed before a noun or pronoun to indicate that someone or something is within a space, a place, or period of time.

Example: There was nothing in the box.

The word 'in' is an adverb when modifying a verb to show movement toward enclosure.

Example: We came in to make lunch.

The word 'in' is an adjective when used to describe someone or something as present or fashionable.

Example: I'll call to see if the doctor is in.