Whom --> who

HUBLOTAre both correct?

Yes. Whom is used mostly in formal writing these days.

She didn’t know who she was talking to. (informal)
She didn’t know whom she was talking to. (somewhat formal)
She did not know whom she was talking to. (formal)
She did not know to whom she was talking. (very formal, st

Hi Aspara Gus, I have read that , in case of objective case pronoun we use "whom" and in case of subjective case pronoun we use "who". So in this sentence "She didn't know whom I was talking to"- whom is used as an object. Am I right?

Sam28So in this sentence "She didn't know whom I was talking to"- whom is used as an object. Am I right?

Yes, you are right. Do note that this rule is rarely observed outside formal English, so whom is not required for grammatical correctness.

Okay, I made a note of it. Thanks a lot!

Thank you so much, AG.

HUBOLT, sorry for hijacking your thread in the middle

Never mind, Sam. Thanks for sticking to the topic.