In the sentence "Introduce the guests, with _______ you will be sharing the ideas for the fundraiser."
would I use who, whom, whoever, or whomever in the blank and why?
I would put "Introduce the guests, with whom you will be sharing the ideas for the fundraiser" because you need a pronoun which functions as an object, and whom is the best choice. Who(m)ever doesn't really seem correct here.
