You’re the only one whom (sic) mistakenly thinks that is ungrammatical. It’s a somewhat complex sentence, with the indirect object “you” being emphasized, and being the subject since this is passive. “I gave the deadline to you” becomes “I gave you the deadline” becomes “You’re the one I gave the deadline.” Now if she had used the preposition “to” (“gave the outline to”) pedants wouldn’t know which bogus rule to argue for: using “whom” or "not ending a sending with a proposition.
I wrote a book report on Ben Hur in 7th grade while home with the flu. I got an A. I presented the same report orally in 8th, and got an A. I turned it in in several more grades, getting an A each time. It was literally the only book report I wrote in junior and senior high.
You’re the only one whom (sic) mistakenly thinks that is ungrammatical. It’s a somewhat complex sentence, with the indirect object “you” being emphasized, and being the subject since this is passive. “I gave the deadline to you” becomes “I gave you the deadline” becomes “You’re the one I gave the deadline.” Now if she had used the preposition “to” (“gave the outline to”) pedants wouldn’t know which bogus rule to argue for: using “whom” or "not ending a sending with a proposition.