Thread:Themasterofdenial/@comment-8-20170404173604/@comment-28960899-20170405064311

Actually, you're allowed to split prepositional phrases in English, including those in relative clauses, so "the person whom you are talking to" is correct. There is no rule restricting the separation of prepositions from their grammatical object.

Additionally, "the person who you are talking to" is incorrect. In English, regardless of whether or not the preposition is next to the relative pronoun, all words must be in their correct grammatical form. "Whom" is the accusative form used for the objects of verbs and of prepositions. Because the relative pronoun is still the object of the preposition, even though it has been separated from it, it must still be the accusative form "whom".

"Whom" is not obsolete, and there is no flexibility regarding its use. You cannot use "who" when you are supposed to use "whom".