Here's why:
* Coordinating conjunction: When "yet" connects two clauses or phrases of equal grammatical rank, it acts as a coordinating conjunction. For example:
* "I'm tired, yet I still need to finish this task."
* "She was a talented musician, yet she never pursued a career in music."
* Adverb: When "yet" modifies a verb, adjective, or another adverb, it functions as an adverb. For example:
* "It's yet too early to tell the outcome." (modifies the adjective "early")
* "He's yet to answer my question." (modifies the verb "to answer")
* "I haven't finished the project yet." (modifies the verb "finished")
So, the function of "yet" depends on the context of the sentence.