* Conjunction: When it joins two words, phrases, or clauses, usually expressing a choice between them.
* Example: "You can have either the chicken or the fish."
* Pronoun: When it stands in for a noun or noun phrase, usually referring to one of two options.
* Example: "Either of these shirts will work for the occasion."
* Adverb: When it modifies an adjective or another adverb, usually expressing a negative idea.
* Example: "The news was either good or bad, but it wasn't clear which."
To determine the part of speech of "either," you need to look at how it's used in the sentence.