* Pronoun: This is the most common use. It acts as a pronoun replacing a noun phrase, often referring to all things in a particular context.
* Example: "Everything is ready for the party."
* Adjective: It can modify a noun, meaning "all" or "whole".
* Example: "She gave me everything she had."
* Noun: It can function as a noun, referring to all things in general.
* Example: "You need to learn everything about this job."
The specific part of speech depends on its context and function within the sentence.